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52521865 = 511286813
BaseRepresentation
bin1100100001011…
…0101110001001
310122211101110021
43020112232021
5101421144430
65113420441
71205266654
oct310265611
9118741407
1052521865
1127713500
121570a721
13ab5c236
146d9289b
15492707a
hex3216b89

52521865 has 12 divisors (see below), whose sum is σ = 69277572. Its totient is φ = 38197280.

The previous prime is 52521851. The next prime is 52521869. The reversal of 52521865 is 56812525.

It can be written as a sum of positive squares in 2 ways, for example, as 28344976 + 24176889 = 5324^2 + 4917^2 .

It is not a de Polignac number, because 52521865 - 29 = 52521353 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 52521865.

It is not an unprimeable number, because it can be changed into a prime (52521869) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 42802 + ... + 44011.

It is an arithmetic number, because the mean of its divisors is an integer number (5773131).

Almost surely, 252521865 is an apocalyptic number.

52521865 is a gapful number since it is divisible by the number (55) formed by its first and last digit.

It is an amenable number.

52521865 is a deficient number, since it is larger than the sum of its proper divisors (16755707).

52521865 is a wasteful number, since it uses less digits than its factorization.

52521865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86840 (or 86829 counting only the distinct ones).

The product of its digits is 24000, while the sum is 34.

The square root of 52521865 is about 7247.1970443752. The cubic root of 52521865 is about 374.4955944302.

It can be divided in two parts, 5252 and 1865, that added together give a palindrome (7117).

The spelling of 52521865 in words is "fifty-two million, five hundred twenty-one thousand, eight hundred sixty-five".

Divisors: 1 5 11 55 121 605 86813 434065 954943 4774715 10504373 52521865