80581591 has 4 divisors (see below), whose sum is σ = 80604792. Its totient is φ = 80558392.

The previous prime is 80581577. The next prime is 80581601. The reversal of 80581591 is 19518508.

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 80581591 - 2⁵ = 80581559 is a prime.

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 80581591.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (80581511) 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, 5221 + ... + 13726.

It is an arithmetic number, because the mean of its divisors is an integer number (20151198).

Almost surely, 2^80581591 is an apocalyptic number.

80581591 is a deficient number, since it is larger than the sum of its proper divisors (23201).

80581591 is a wasteful number, since it uses less digits than its factorization.

80581591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23200.

The product of its (nonzero) digits is 14400, while the sum is 37.

The square root of 80581591 is about 8976.7249595830. The cubic root of 80581591 is about 431.9285843738.

The spelling of 80581591 in words is "eighty million, five hundred eighty-one thousand, five hundred ninety-one".