53031581 has 2 divisors, whose sum is σ = 53031582. Its totient is φ = 53031580.

The previous prime is 53031577. The next prime is 53031611. The reversal of 53031581 is 18513035.

53031581 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 37625956 + 15405625 = 6134^2 + 3925^2 .

It is a cyclic number.

It is not a de Polignac number, because 53031581 - 2² = 53031577 is a prime.

It is a super-2 number, since 2×53031581² = 5624697166719122, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 53031581.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (53031521) 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 as a sum of consecutive naturals, namely, 26515790 + 26515791.

It is an arithmetic number, because the mean of its divisors is an integer number (26515791).

Almost surely, 2^53031581 is an apocalyptic number.

It is an amenable number.

53031581 is a deficient number, since it is larger than the sum of its proper divisors (1).

53031581 is an equidigital number, since it uses as much as digits as its factorization.

53031581 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1800, while the sum is 26.

The square root of 53031581 is about 7282.2785582536. The cubic root of 53031581 is about 375.7031689480.

The spelling of 53031581 in words is "fifty-three million, thirty-one thousand, five hundred eighty-one".