521522431 has 8 divisors (see below), whose sum is σ = 550742400. Its totient is φ = 492479640.

The previous prime is 521522429. The next prime is 521522453. The reversal of 521522431 is 134225125.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 521522431 - 2¹ = 521522429 is a prime.

It is a super-2 number, since 2×521522431² = 543971292072299522, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 521522396 and 521522405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (521522411) 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, 38221 + ... + 50038.

It is an arithmetic number, because the mean of its divisors is an integer number (68842800).

Almost surely, 2^521522431 is an apocalyptic number.

521522431 is a deficient number, since it is larger than the sum of its proper divisors (29219969).

521522431 is a wasteful number, since it uses less digits than its factorization.

521522431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88589.

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

The square root of 521522431 is about 22836.8656124259. The cubic root of 521522431 is about 804.9291662530.

Adding to 521522431 its reverse (134225125), we get a palindrome (655747556).

The spelling of 521522431 in words is "five hundred twenty-one million, five hundred twenty-two thousand, four hundred thirty-one".