80716591 has 16 divisors (see below), whose sum is σ = 88104960. Its totient is φ = 73719360.

The previous prime is 80716583. The next prime is 80716607. The reversal of 80716591 is 19561708.

It is a cyclic number.

It is not a de Polignac number, because 80716591 - 2³ = 80716583 is a prime.

It is a super-2 number, since 2×80716591² = 13030336125322562, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 80716591.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (80716511) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 55611 + ... + 57043.

It is an arithmetic number, because the mean of its divisors is an integer number (5506560).

Almost surely, 2^80716591 is an apocalyptic number.

80716591 is a deficient number, since it is larger than the sum of its proper divisors (7388369).

80716591 is a wasteful number, since it uses less digits than its factorization.

80716591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1566.

The product of its (nonzero) digits is 15120, while the sum is 37.

The square root of 80716591 is about 8984.2412590046. The cubic root of 80716591 is about 432.1696560859.

The spelling of 80716591 in words is "eighty million, seven hundred sixteen thousand, five hundred ninety-one".