81376963 has 2 divisors, whose sum is σ = 81376964. Its totient is φ = 81376962.

The previous prime is 81376931. The next prime is 81376979. The reversal of 81376963 is 36967318.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 81376963 - 2⁵ = 81376931 is a prime.

It is not a weakly prime, because it can be changed into another prime (81376993) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40688481 + 40688482.

It is an arithmetic number, because the mean of its divisors is an integer number (40688482).

Almost surely, 2^81376963 is an apocalyptic number.

81376963 is a deficient number, since it is larger than the sum of its proper divisors (1).

81376963 is an equidigital number, since it uses as much as digits as its factorization.

81376963 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 163296, while the sum is 43.

The square root of 81376963 is about 9020.9180796635. The cubic root of 81376963 is about 433.3450359101.

The spelling of 81376963 in words is "eighty-one million, three hundred seventy-six thousand, nine hundred sixty-three".