80491731 has 8 divisors (see below), whose sum is σ = 107466384. Its totient is φ = 53589120.

The previous prime is 80491727. The next prime is 80491739. The reversal of 80491731 is 13719408.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 80491731 - 2² = 80491727 is a prime.

It is a super-2 number, since 2×80491731² = 12957837518752722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 80491692 and 80491701.

It is not an unprimeable number, because it can be changed into a prime (80491739) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15346 + ... + 19911.

It is an arithmetic number, because the mean of its divisors is an integer number (13433298).

Almost surely, 2^80491731 is an apocalyptic number.

80491731 is a deficient number, since it is larger than the sum of its proper divisors (26974653).

80491731 is a wasteful number, since it uses less digits than its factorization.

80491731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36021.

The product of its (nonzero) digits is 6048, while the sum is 33.

The square root of 80491731 is about 8971.7183972748. The cubic root of 80491731 is about 431.7679706056.

The spelling of 80491731 in words is "eighty million, four hundred ninety-one thousand, seven hundred thirty-one".