80811631 has 2 divisors, whose sum is σ = 80811632. Its totient is φ = 80811630.

The previous prime is 80811629. The next prime is 80811667. The reversal of 80811631 is 13611808.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 80811631 - 2¹ = 80811629 is a prime.

It is a super-2 number, since 2×80811631² = 13061039409760322, which contains 22 as substring.

Together with 80811629, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 80811631.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (80811671) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40405815 + 40405816.

It is an arithmetic number, because the mean of its divisors is an integer number (40405816).

Almost surely, 2^80811631 is an apocalyptic number.

80811631 is a deficient number, since it is larger than the sum of its proper divisors (1).

80811631 is an equidigital number, since it uses as much as digits as its factorization.

80811631 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1152, while the sum is 28.

The square root of 80811631 is about 8989.5289643006. The cubic root of 80811631 is about 432.3392093895.

The spelling of 80811631 in words is "eighty million, eight hundred eleven thousand, six hundred thirty-one".