80491531 has 4 divisors (see below), whose sum is σ = 83088064. Its totient is φ = 77895000.

The previous prime is 80491529. The next prime is 80491553. The reversal of 80491531 is 13519408.

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 80491531 - 2¹ = 80491529 is a prime.

It is a super-2 number, since 2×80491531² = 12957773125447922, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (31), and also a Moran number because the ratio is a prime number: 2596501 = 80491531 / (8 + 0 + 4 + 9 + 1 + 5 + 3 + 1).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 80491493 and 80491502.

It is not an unprimeable number, because it can be changed into a prime (80491561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1298220 + ... + 1298281.

It is an arithmetic number, because the mean of its divisors is an integer number (20772016).

Almost surely, 2^80491531 is an apocalyptic number.

80491531 is a deficient number, since it is larger than the sum of its proper divisors (2596533).

80491531 is a wasteful number, since it uses less digits than its factorization.

80491531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2596532.

The product of its (nonzero) digits is 4320, while the sum is 31.

The square root of 80491531 is about 8971.7072511312. The cubic root of 80491531 is about 431.7676129968.

The spelling of 80491531 in words is "eighty million, four hundred ninety-one thousand, five hundred thirty-one".