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649481 = 7314173
BaseRepresentation
bin10011110100100001001
31012222220212
42132210021
5131240411
621530505
75343350
oct2364411
91188825
10649481
11403a68
12273a35
13199811
1412c997
15cc68b
hex9e909

649481 has 16 divisors (see below), whose sum is σ = 795648. Its totient is φ = 518400.

The previous prime is 649471. The next prime is 649483. The reversal of 649481 is 184946.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2k-649481 is a prime.

It is a super-2 number, since 2×6494812 = 843651138722, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 649481.

It is not an unprimeable number, because it can be changed into a prime (649483) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8861 + ... + 8933.

It is an arithmetic number, because the mean of its divisors is an integer number (49728).

2649481 is an apocalyptic number.

It is an amenable number.

649481 is a deficient number, since it is larger than the sum of its proper divisors (146167).

649481 is a wasteful number, since it uses less digits than its factorization.

649481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 152.

The product of its digits is 6912, while the sum is 32.

The square root of 649481 is about 805.9038404177. The cubic root of 649481 is about 86.6008491082.

The spelling of 649481 in words is "six hundred forty-nine thousand, four hundred eighty-one".

Divisors: 1 7 31 41 73 217 287 511 1271 2263 2993 8897 15841 20951 92783 649481