80126991 has 24 divisors (see below), whose sum is σ = 133132064. Its totient is φ = 45489600.

The previous prime is 80126989. The next prime is 80126993. The reversal of 80126991 is 19962108.

It is an interprime number because it is at equal distance from previous prime (80126989) and next prime (80126993).

It is not a de Polignac number, because 80126991 - 2¹ = 80126989 is a prime.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (80126993) 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, 5841 + ... + 13941.

Almost surely, 2^80126991 is an apocalyptic number.

80126991 is a deficient number, since it is larger than the sum of its proper divisors (53005073).

80126991 is a wasteful number, since it uses less digits than its factorization.

80126991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8271 (or 8268 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 36.

The square root of 80126991 is about 8951.3681077252. The cubic root of 80126991 is about 431.1148123204.

The spelling of 80126991 in words is "eighty million, one hundred twenty-six thousand, nine hundred ninety-one".