182681981 has 2 divisors, whose sum is σ = 182681982. Its totient is φ = 182681980.

The previous prime is 182681959. The next prime is 182682011. The reversal of 182681981 is 189186281.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 106399225 + 76282756 = 10315^2 + 8734^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-182681981 is a prime.

It is a super-2 number, since 2×182681981² = 66745412364168722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (182681581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 91340990 + 91340991.

It is an arithmetic number, because the mean of its divisors is an integer number (91340991).

Almost surely, 2^182681981 is an apocalyptic number.

It is an amenable number.

182681981 is a deficient number, since it is larger than the sum of its proper divisors (1).

182681981 is an equidigital number, since it uses as much as digits as its factorization.

182681981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 55296, while the sum is 44.

The square root of 182681981 is about 13515.9898268680. The cubic root of 182681981 is about 567.4120712224.

The spelling of 182681981 in words is "one hundred eighty-two million, six hundred eighty-one thousand, nine hundred eighty-one".