53031681 has 6 divisors (see below), whose sum is σ = 76601330. Its totient is φ = 35354448.

The previous prime is 53031623. The next prime is 53031683. The reversal of 53031681 is 18613035.

It can be written as a sum of positive squares in only one way, i.e., 35892081 + 17139600 = 5991^2 + 4140^2 .

It is not a de Polignac number, because 53031681 - 2⁷ = 53031553 is a prime.

It is a super-2 number, since 2×53031681² = 5624718379371522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (53031683) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2946196 + ... + 2946213.

Almost surely, 2^53031681 is an apocalyptic number.

It is an amenable number.

53031681 is a deficient number, since it is larger than the sum of its proper divisors (23569649).

53031681 is a wasteful number, since it uses less digits than its factorization.

53031681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5892415 (or 5892412 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 27.

The square root of 53031681 is about 7282.2854242332. The cubic root of 53031681 is about 375.7034050984.

The spelling of 53031681 in words is "fifty-three million, thirty-one thousand, six hundred eighty-one".