81956683 has 2 divisors, whose sum is σ = 81956684. Its totient is φ = 81956682.

The previous prime is 81956627. The next prime is 81956687. The reversal of 81956683 is 38665918.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 81956683 - 2²⁵ = 48402251 is a prime.

It is not a weakly prime, because it can be changed into another prime (81956687) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40978341 + 40978342.

It is an arithmetic number, because the mean of its divisors is an integer number (40978342).

Almost surely, 2^81956683 is an apocalyptic number.

81956683 is a deficient number, since it is larger than the sum of its proper divisors (1).

81956683 is an equidigital number, since it uses as much as digits as its factorization.

81956683 is an evil number, because the sum of its binary digits is even.

The product of its digits is 311040, while the sum is 46.

The square root of 81956683 is about 9052.9930409782. The cubic root of 81956683 is about 434.3716351412.

It can be divided in two parts, 8195 and 6683, that added together give a triangular number (14878 = T₁₇₂).

The spelling of 81956683 in words is "eighty-one million, nine hundred fifty-six thousand, six hundred eighty-three".