521115402 has 8 divisors (see below), whose sum is σ = 1042230816. Its totient is φ = 173705132.

The previous prime is 521115379. The next prime is 521115403. The reversal of 521115402 is 204511125.

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

521115402 is an admirable number.

It is a super-2 number, since 2×521115402² = 543122524403243208, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (521115403) 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, 43426278 + ... + 43426289.

It is an arithmetic number, because the mean of its divisors is an integer number (130278852).

Almost surely, 2^521115402 is an apocalyptic number.

521115402 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

521115402 is a wasteful number, since it uses less digits than its factorization.

521115402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86852572.

The product of its (nonzero) digits is 400, while the sum is 21.

The square root of 521115402 is about 22827.9522077649. The cubic root of 521115402 is about 804.7197059209.

Adding to 521115402 its reverse (204511125), we get a palindrome (725626527).

The spelling of 521115402 in words is "five hundred twenty-one million, one hundred fifteen thousand, four hundred two".