521521432 has 32 divisors (see below), whose sum is σ = 1012129920. Its totient is φ = 251665920.

The previous prime is 521521421. The next prime is 521521433. The reversal of 521521432 is 234125125.

It is a junction number, because it is equal to n+sod(n) for n = 521521397 and 521521406.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (521521433) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 95808 + ... + 101104.

It is an arithmetic number, because the mean of its divisors is an integer number (31629060).

Almost surely, 2^521521432 is an apocalyptic number.

It is an amenable number.

521521432 is a deficient number, since it is larger than the sum of its proper divisors (490608488).

521521432 is a wasteful number, since it uses less digits than its factorization.

521521432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5731 (or 5727 counting only the distinct ones).

The product of its digits is 2400, while the sum is 25.

The square root of 521521432 is about 22836.8437398866. The cubic root of 521521432 is about 804.9286522932.

Adding to 521521432 its reverse (234125125), we get a palindrome (755646557).

The spelling of 521521432 in words is "five hundred twenty-one million, five hundred twenty-one thousand, four hundred thirty-two".