53916581 has 2 divisors, whose sum is σ = 53916582. Its totient is φ = 53916580.

The previous prime is 53916521. The next prime is 53916613. The reversal of 53916581 is 18561935.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 52780225 + 1136356 = 7265^2 + 1066^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-53916581 is a prime.

It is a super-2 number, since 2×53916581² = 5813995413459122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (53916521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26958290 + 26958291.

It is an arithmetic number, because the mean of its divisors is an integer number (26958291).

Almost surely, 2^53916581 is an apocalyptic number.

It is an amenable number.

53916581 is a deficient number, since it is larger than the sum of its proper divisors (1).

53916581 is an equidigital number, since it uses as much as digits as its factorization.

53916581 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 32400, while the sum is 38.

The square root of 53916581 is about 7342.7910905867. The cubic root of 53916581 is about 377.7815825229.

The spelling of 53916581 in words is "fifty-three million, nine hundred sixteen thousand, five hundred eighty-one".