521042965 has 16 divisors (see below), whose sum is σ = 644621040. Its totient is φ = 404052480.

The previous prime is 521042927. The next prime is 521042981. The reversal of 521042965 is 569240125.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 107205316 + 413837649 = 10354^2 + 20343^2 .

It is not a de Polignac number, because 521042965 - 2¹¹ = 521040917 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 521042965.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24091 + ... + 40279.

It is an arithmetic number, because the mean of its divisors is an integer number (40288815).

Almost surely, 2^521042965 is an apocalyptic number.

It is an amenable number.

521042965 is a deficient number, since it is larger than the sum of its proper divisors (123578075).

521042965 is a wasteful number, since it uses less digits than its factorization.

521042965 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16392.

The product of its (nonzero) digits is 21600, while the sum is 34.

The square root of 521042965 is about 22826.3655670367. The cubic root of 521042965 is about 804.6824178383.

The spelling of 521042965 in words is "five hundred twenty-one million, forty-two thousand, nine hundred sixty-five".