80818979 has 4 divisors (see below), whose sum is σ = 80950584. Its totient is φ = 80687376.

The previous prime is 80818963. The next prime is 80818981. The reversal of 80818979 is 97981808.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 80818979 - 2⁴ = 80818963 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (80818939) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 64877 + ... + 66110.

It is an arithmetic number, because the mean of its divisors is an integer number (20237646).

Almost surely, 2^80818979 is an apocalyptic number.

80818979 is a deficient number, since it is larger than the sum of its proper divisors (131605).

80818979 is a wasteful number, since it uses less digits than its factorization.

80818979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 131604.

The product of its (nonzero) digits is 290304, while the sum is 50.

The square root of 80818979 is about 8989.9376527315. The cubic root of 80818979 is about 432.3523128342.

The spelling of 80818979 in words is "eighty million, eight hundred eighteen thousand, nine hundred seventy-nine".