80818391 has 8 divisors (see below), whose sum is σ = 86331744. Its totient is φ = 75389440.

The previous prime is 80818379. The next prime is 80818393. The reversal of 80818391 is 19381808.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 80818391 - 2⁶ = 80818327 is a prime.

It is a super-2 number, since 2×80818391² = 13063224647657762, 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 (80818393) 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 7 ways as a sum of consecutive naturals, for example, 19115 + ... + 22956.

It is an arithmetic number, because the mean of its divisors is an integer number (10791468).

Almost surely, 2^80818391 is an apocalyptic number.

80818391 is a deficient number, since it is larger than the sum of its proper divisors (5513353).

80818391 is a wasteful number, since it uses less digits than its factorization.

80818391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42201.

The product of its (nonzero) digits is 13824, while the sum is 38.

The square root of 80818391 is about 8989.9049494419. The cubic root of 80818391 is about 432.3512643026.

The spelling of 80818391 in words is "eighty million, eight hundred eighteen thousand, three hundred ninety-one".