53015981 has 2 divisors, whose sum is σ = 53015982. Its totient is φ = 53015980.

The previous prime is 53015971. The next prime is 53015999. The reversal of 53015981 is 18951035.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 49984900 + 3031081 = 7070^2 + 1741^2 .

It is a cyclic number.

It is not a de Polignac number, because 53015981 - 2²² = 48821677 is a prime.

It is a super-2 number, since 2×53015981² = 5621388482784722, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (53015951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26507990 + 26507991.

It is an arithmetic number, because the mean of its divisors is an integer number (26507991).

Almost surely, 2^53015981 is an apocalyptic number.

It is an amenable number.

53015981 is a deficient number, since it is larger than the sum of its proper divisors (1).

53015981 is an equidigital number, since it uses as much as digits as its factorization.

53015981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5400, while the sum is 32.

The square root of 53015981 is about 7281.2073861414. The cubic root of 53015981 is about 375.6663258436. Note that the first 3 decimals are identical.

The spelling of 53015981 in words is "fifty-three million, fifteen thousand, nine hundred eighty-one".