521132431 has 4 divisors (see below), whose sum is σ = 521624664. Its totient is φ = 520640200.

The previous prime is 521132401. The next prime is 521132441. The reversal of 521132431 is 134231125.

It is a happy number.

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 521132431 - 2⁷ = 521132303 is a prime.

It is a super-2 number, since 2×521132431² = 543158021279939522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (521132401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 244525 + ... + 246646.

It is an arithmetic number, because the mean of its divisors is an integer number (130406166).

Almost surely, 2^521132431 is an apocalyptic number.

521132431 is a deficient number, since it is larger than the sum of its proper divisors (492233).

521132431 is a wasteful number, since it uses less digits than its factorization.

521132431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 492232.

The product of its digits is 720, while the sum is 22.

The square root of 521132431 is about 22828.3251904295. The cubic root of 521132431 is about 804.7284713642.

Adding to 521132431 its reverse (134231125), we get a palindrome (655363556).

The spelling of 521132431 in words is "five hundred twenty-one million, one hundred thirty-two thousand, four hundred thirty-one".