53121656 has 32 divisors (see below), whose sum is σ = 116259840. Its totient is φ = 22280928.

The previous prime is 53121637. The next prime is 53121659. The reversal of 53121656 is 65612135.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (53121659) 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, 7460 + ... + 12723.

It is an arithmetic number, because the mean of its divisors is an integer number (3633120).

Almost surely, 2^53121656 is an apocalyptic number.

53121656 is a gapful number since it is divisible by the number (56) formed by its first and last digit.

It is an amenable number.

53121656 is an abundant number, since it is smaller than the sum of its proper divisors (63138184).

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

53121656 is a wasteful number, since it uses less digits than its factorization.

53121656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20243 (or 20239 counting only the distinct ones).

The product of its digits is 5400, while the sum is 29.

The square root of 53121656 is about 7288.4604684391. The cubic root of 53121656 is about 375.9157612705.

The spelling of 53121656 in words is "fifty-three million, one hundred twenty-one thousand, six hundred fifty-six".