521430025231 has 4 divisors (see below), whose sum is σ = 521433154264. Its totient is φ = 521426896200.

The previous prime is 521430025229. The next prime is 521430025243. The reversal of 521430025231 is 132520034125.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 521430025231 - 2¹ = 521430025229 is a prime.

It is a super-2 number, since 2×521430025231² (a number of 24 digits) contains 22 as substring.

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 521430025231.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (521430025201) 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, 1299600 + ... + 1652821.

It is an arithmetic number, because the mean of its divisors is an integer number (130358288566).

Almost surely, 2^521430025231 is an apocalyptic number.

521430025231 is a deficient number, since it is larger than the sum of its proper divisors (3129033).

521430025231 is a wasteful number, since it uses less digits than its factorization.

521430025231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3129032.

The product of its (nonzero) digits is 7200, while the sum is 28.

Adding to 521430025231 its reverse (132520034125), we get a palindrome (653950059356).

The spelling of 521430025231 in words is "five hundred twenty-one billion, four hundred thirty million, twenty-five thousand, two hundred thirty-one".