80365981 has 16 divisors (see below), whose sum is σ = 84787200. Its totient is φ = 76083840.

The previous prime is 80365969. The next prime is 80365997. The reversal of 80365981 is 18956308.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 80365981 - 2⁵ = 80365949 is a prime.

It is a super-2 number, since 2×80365981² = 12917381804184722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (80365921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 539295 + ... + 539443.

It is an arithmetic number, because the mean of its divisors is an integer number (5299200).

Almost surely, 2^80365981 is an apocalyptic number.

It is an amenable number.

80365981 is a deficient number, since it is larger than the sum of its proper divisors (4421219).

80365981 is a wasteful number, since it uses less digits than its factorization.

80365981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 444.

The product of its (nonzero) digits is 51840, while the sum is 40.

The square root of 80365981 is about 8964.7075245097. The cubic root of 80365981 is about 431.5430070364.

The spelling of 80365981 in words is "eighty million, three hundred sixty-five thousand, nine hundred eighty-one".