81793963 has 2 divisors, whose sum is σ = 81793964. Its totient is φ = 81793962.

The previous prime is 81793931. The next prime is 81793981. The reversal of 81793963 is 36939718.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 81793963 - 2⁵ = 81793931 is a prime.

It is not a weakly prime, because it can be changed into another prime (81793913) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40896981 + 40896982.

It is an arithmetic number, because the mean of its divisors is an integer number (40896982).

Almost surely, 2^81793963 is an apocalyptic number.

81793963 is a deficient number, since it is larger than the sum of its proper divisors (1).

81793963 is an equidigital number, since it uses as much as digits as its factorization.

81793963 is an evil number, because the sum of its binary digits is even.

The product of its digits is 244944, while the sum is 46.

The square root of 81793963 is about 9044.0014927022. The cubic root of 81793963 is about 434.0839718736.

It can be divided in two parts, 8 and 1793963, that added together give a palindrome (1793971).

The spelling of 81793963 in words is "eighty-one million, seven hundred ninety-three thousand, nine hundred sixty-three".