521125697 has 4 divisors (see below), whose sum is σ = 543783360. Its totient is φ = 498468036.

The previous prime is 521125691. The next prime is 521125699. The reversal of 521125697 is 796521125.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-521125697 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 521125697.

It is not an unprimeable number, because it can be changed into a prime (521125691) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11328797 + ... + 11328842.

It is an arithmetic number, because the mean of its divisors is an integer number (135945840).

Almost surely, 2^521125697 is an apocalyptic number.

It is an amenable number.

521125697 is a deficient number, since it is larger than the sum of its proper divisors (22657663).

521125697 is a wasteful number, since it uses less digits than its factorization.

521125697 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22657662.

The product of its digits is 37800, while the sum is 38.

The square root of 521125697 is about 22828.1776977489. The cubic root of 521125697 is about 804.7250051532.

The spelling of 521125697 in words is "five hundred twenty-one million, one hundred twenty-five thousand, six hundred ninety-seven".