80611999 has 4 divisors (see below), whose sum is σ = 86812936. Its totient is φ = 74411064.

The previous prime is 80611961. The next prime is 80612009. The reversal of 80611999 is 99911608.

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

It is not a de Polignac number, because 80611999 - 2²³ = 72223391 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (80611939) 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, 3100449 + ... + 3100474.

It is an arithmetic number, because the mean of its divisors is an integer number (21703234).

Almost surely, 2^80611999 is an apocalyptic number.

80611999 is a deficient number, since it is larger than the sum of its proper divisors (6200937).

80611999 is a wasteful number, since it uses less digits than its factorization.

80611999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6200936.

The product of its (nonzero) digits is 34992, while the sum is 43.

The square root of 80611999 is about 8978.4185133018. The cubic root of 80611999 is about 431.9829079172.

The spelling of 80611999 in words is "eighty million, six hundred eleven thousand, nine hundred ninety-nine".