52685981 has 2 divisors, whose sum is σ = 52685982. Its totient is φ = 52685980.

The previous prime is 52685977. The next prime is 52685987. The reversal of 52685981 is 18958625.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 39062500 + 13623481 = 6250^2 + 3691^2 .

It is a cyclic number.

It is not a de Polignac number, because 52685981 - 2² = 52685977 is a prime.

It is a super-2 number, since 2×52685981² = 5551625187864722, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (52685987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26342990 + 26342991.

It is an arithmetic number, because the mean of its divisors is an integer number (26342991).

Almost surely, 2^52685981 is an apocalyptic number.

It is an amenable number.

52685981 is a deficient number, since it is larger than the sum of its proper divisors (1).

52685981 is an equidigital number, since it uses as much as digits as its factorization.

52685981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 172800, while the sum is 44.

The square root of 52685981 is about 7258.5109354467. The cubic root of 52685981 is about 374.8852531883.

The spelling of 52685981 in words is "fifty-two million, six hundred eighty-five thousand, nine hundred eighty-one".