81882511 has 2 divisors, whose sum is σ = 81882512. Its totient is φ = 81882510.

The previous prime is 81882497. The next prime is 81882527. The reversal of 81882511 is 11528818.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81882511 is a prime.

It is equal to p_4772932 and since 81882511 and 4772932 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81882011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40941255 + 40941256.

It is an arithmetic number, because the mean of its divisors is an integer number (40941256).

Almost surely, 2^81882511 is an apocalyptic number.

81882511 is a deficient number, since it is larger than the sum of its proper divisors (1).

81882511 is an equidigital number, since it uses as much as digits as its factorization.

81882511 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5120, while the sum is 34.

The square root of 81882511 is about 9048.8955679685. The cubic root of 81882511 is about 434.2405580244.

The spelling of 81882511 in words is "eighty-one million, eight hundred eighty-two thousand, five hundred eleven".