80069991 has 4 divisors (see below), whose sum is σ = 106759992. Its totient is φ = 53379992.

The previous prime is 80069989. The next prime is 80070013. The reversal of 80069991 is 19996008.

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 80069991 - 2¹ = 80069989 is a prime.

It is a super-2 number, since 2×80069991² = 12822406917480162, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (80069921) 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, 13344996 + ... + 13345001.

It is an arithmetic number, because the mean of its divisors is an integer number (26689998).

Almost surely, 2^80069991 is an apocalyptic number.

80069991 is a deficient number, since it is larger than the sum of its proper divisors (26690001).

80069991 is a wasteful number, since it uses less digits than its factorization.

80069991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26690000.

The product of its (nonzero) digits is 34992, while the sum is 42.

The square root of 80069991 is about 8948.1836704440. The cubic root of 80069991 is about 431.0125605769.

The spelling of 80069991 in words is "eighty million, sixty-nine thousand, nine hundred ninety-one".