80517939 has 4 divisors (see below), whose sum is σ = 107357256. Its totient is φ = 53678624.

The previous prime is 80517929. The next prime is 80517989. The reversal of 80517939 is 93971508.

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 80517939 - 2⁴ = 80517923 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 80517939.

It is not an unprimeable number, because it can be changed into a prime (80517919) 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, 13419654 + ... + 13419659.

It is an arithmetic number, because the mean of its divisors is an integer number (26839314).

Almost surely, 2^80517939 is an apocalyptic number.

80517939 is a deficient number, since it is larger than the sum of its proper divisors (26839317).

80517939 is a wasteful number, since it uses less digits than its factorization.

80517939 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26839316.

The product of its (nonzero) digits is 68040, while the sum is 42.

The square root of 80517939 is about 8973.1788681604. The cubic root of 80517939 is about 431.8148265452.

The spelling of 80517939 in words is "eighty million, five hundred seventeen thousand, nine hundred thirty-nine".