80809731 has 10 divisors (see below), whose sum is σ = 120715892. Its totient is φ = 53873100.

The previous prime is 80809727. The next prime is 80809733. The reversal of 80809731 is 13790808.

It is not a de Polignac number, because 80809731 - 2² = 80809727 is a prime.

It is a super-2 number, since 2×80809731² = 13060425248584722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (80809733) 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 in 9 ways as a sum of consecutive naturals, for example, 498745 + ... + 498906.

Almost surely, 2^80809731 is an apocalyptic number.

80809731 is a gapful number since it is divisible by the number (81) formed by its first and last digit.

80809731 is a deficient number, since it is larger than the sum of its proper divisors (39906161).

80809731 is an equidigital number, since it uses as much as digits as its factorization.

80809731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 997663 (or 997654 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 36.

The square root of 80809731 is about 8989.4232851724. The cubic root of 80809731 is about 432.3358210532.

The spelling of 80809731 in words is "eighty million, eight hundred nine thousand, seven hundred thirty-one".