81790867 has 2 divisors, whose sum is σ = 81790868. Its totient is φ = 81790866.

The previous prime is 81790861. The next prime is 81790873. The reversal of 81790867 is 76809718.

It is a balanced prime because it is at equal distance from previous prime (81790861) and next prime (81790873).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81790867 is a prime.

It is a super-2 number, since 2×81790867² = 13379491849223378, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (81790861) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40895433 + 40895434.

It is an arithmetic number, because the mean of its divisors is an integer number (40895434).

Almost surely, 2^81790867 is an apocalyptic number.

81790867 is a deficient number, since it is larger than the sum of its proper divisors (1).

81790867 is an equidigital number, since it uses as much as digits as its factorization.

81790867 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 169344, while the sum is 46.

The square root of 81790867 is about 9043.8303279086. The cubic root of 81790867 is about 434.0784949374.

The spelling of 81790867 in words is "eighty-one million, seven hundred ninety thousand, eight hundred sixty-seven".