Base | Representation |
---|---|
bin | 1100010101010… |
… | …0000101001101 |
3 | 10121022212211201 |
4 | 3011110011031 |
5 | 101220141441 |
6 | 5044345501 |
7 | 1165436434 |
oct | 305240515 |
9 | 117285751 |
10 | 51724621 |
11 | 27219523 |
12 | 153a5291 |
13 | a9403b0 |
14 | 6c2611b |
15 | 481ac31 |
hex | 315414d |
51724621 has 4 divisors (see below), whose sum is σ = 55703452. Its totient is φ = 47745792.
The previous prime is 51724609. The next prime is 51724633. The reversal of 51724621 is 12642715.
It is a semiprime because it is the product of two primes.
It is an interprime number because it is at equal distance from previous prime (51724609) and next prime (51724633).
It can be written as a sum of positive squares in 2 ways, for example, as 25867396 + 25857225 = 5086^2 + 5085^2 .
It is a cyclic number.
It is not a de Polignac number, because 51724621 - 29 = 51724109 is a prime.
It is a Duffinian number.
It is a self number, because there is not a number n which added to its sum of digits gives 51724621.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (51724601) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (11) of ones.
It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1989396 + ... + 1989421.
It is an arithmetic number, because the mean of its divisors is an integer number (13925863).
Almost surely, 251724621 is an apocalyptic number.
51724621 is the 5086-th centered square number.
It is an amenable number.
51724621 is a deficient number, since it is larger than the sum of its proper divisors (3978831).
51724621 is a wasteful number, since it uses less digits than its factorization.
51724621 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 3978830.
The product of its digits is 3360, while the sum is 28.
The square root of 51724621 is about 7191.9831062093. The cubic root of 51724621 is about 372.5910676251.
The spelling of 51724621 in words is "fifty-one million, seven hundred twenty-four thousand, six hundred twenty-one".
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