521025245 has 16 divisors (see below), whose sum is σ = 686033712. Its totient is φ = 377495040.

The previous prime is 521025227. The next prime is 521025257. The reversal of 521025245 is 542520125.

It can be written as a sum of positive squares in 8 ways, for example, as 65885689 + 455139556 = 8117^2 + 21334^2 .

It is not a de Polignac number, because 521025245 - 2⁶ = 521025181 is a prime.

It is a Curzon number.

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, 72176 + ... + 79065.

It is an arithmetic number, because the mean of its divisors is an integer number (42877107).

Almost surely, 2^521025245 is an apocalyptic number.

It is an amenable number.

521025245 is a deficient number, since it is larger than the sum of its proper divisors (165008467).

521025245 is a wasteful number, since it uses less digits than its factorization.

521025245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 151312.

The product of its (nonzero) digits is 4000, while the sum is 26.

The square root of 521025245 is about 22825.9774160933. The cubic root of 521025245 is about 804.6732956641.

The spelling of 521025245 in words is "five hundred twenty-one million, twenty-five thousand, two hundred forty-five".