80581491 has 6 divisors (see below), whose sum is σ = 116395500. Its totient is φ = 53720988.

The previous prime is 80581481. The next prime is 80581511. The reversal of 80581491 is 19418508.

It is not a de Polignac number, because 80581491 - 2⁷ = 80581363 is a prime.

It is not an unprimeable number, because it can be changed into a prime (80581421) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4476741 + ... + 4476758.

It is an arithmetic number, because the mean of its divisors is an integer number (19399250).

Almost surely, 2^80581491 is an apocalyptic number.

80581491 is a deficient number, since it is larger than the sum of its proper divisors (35814009).

80581491 is a wasteful number, since it uses less digits than its factorization.

80581491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8953505 (or 8953502 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 36.

The square root of 80581491 is about 8976.7193896211. The cubic root of 80581491 is about 431.9284057024.

Adding to 80581491 its reverse (19418508), we get a palindrome (99999999).

The spelling of 80581491 in words is "eighty million, five hundred eighty-one thousand, four hundred ninety-one".