521400056 has 8 divisors (see below), whose sum is σ = 977625120. Its totient is φ = 260700024.

The previous prime is 521400053. The next prime is 521400059. The reversal of 521400056 is 650004125.

It is an interprime number because it is at equal distance from previous prime (521400053) and next prime (521400059).

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (521400053) 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 as a sum of consecutive naturals, namely, 32587496 + ... + 32587511.

It is an arithmetic number, because the mean of its divisors is an integer number (122203140).

Almost surely, 2^521400056 is an apocalyptic number.

It is an amenable number.

521400056 is a deficient number, since it is larger than the sum of its proper divisors (456225064).

521400056 is a wasteful number, since it uses less digits than its factorization.

521400056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65175013 (or 65175009 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 23.

The square root of 521400056 is about 22834.1861251940. The cubic root of 521400056 is about 804.8662025743.

The spelling of 521400056 in words is "five hundred twenty-one million, four hundred thousand, fifty-six".