53137721 has 16 divisors (see below), whose sum is σ = 65856000. Its totient is φ = 41750208.

The previous prime is 53137687. The next prime is 53137727. The reversal of 53137721 is 12773135.

53137721 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 53137721 - 2¹⁴ = 53121337 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (53137727) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11600 + ... + 15518.

It is an arithmetic number, because the mean of its divisors is an integer number (4116000).

Almost surely, 2^53137721 is an apocalyptic number.

It is an amenable number.

53137721 is a deficient number, since it is larger than the sum of its proper divisors (12718279).

53137721 is a wasteful number, since it uses less digits than its factorization.

53137721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4088.

The product of its digits is 4410, while the sum is 29.

The square root of 53137721 is about 7289.5624697234. The cubic root of 53137721 is about 375.9536521451.

The spelling of 53137721 in words is "fifty-three million, one hundred thirty-seven thousand, seven hundred twenty-one".