80861391 has 24 divisors (see below), whose sum is σ = 129190880. Its totient is φ = 48413376.

The previous prime is 80861387. The next prime is 80861393. The reversal of 80861391 is 19316808.

It is not a de Polignac number, because 80861391 - 2² = 80861387 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (80861393) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5011 + ... + 13668.

Almost surely, 2^80861391 is an apocalyptic number.

80861391 is a deficient number, since it is larger than the sum of its proper divisors (48329489).

80861391 is a wasteful number, since it uses less digits than its factorization.

80861391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18735 (or 18732 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 36.

The square root of 80861391 is about 8992.2962028616. The cubic root of 80861391 is about 432.4279292297.

The spelling of 80861391 in words is "eighty million, eight hundred sixty-one thousand, three hundred ninety-one".