80315991 has 12 divisors (see below), whose sum is σ = 132585232. Its totient is φ = 45894816.

The previous prime is 80315971. The next prime is 80316013. The reversal of 80315991 is 19951308.

It is a happy number.

It is not a de Polignac number, because 80315991 - 2⁶ = 80315927 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (80315941) 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 11 ways as a sum of consecutive naturals, for example, 637366 + ... + 637491.

Almost surely, 2^80315991 is an apocalyptic number.

80315991 is a deficient number, since it is larger than the sum of its proper divisors (52269241).

80315991 is a wasteful number, since it uses less digits than its factorization.

80315991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1274870 (or 1274867 counting only the distinct ones).

The product of its (nonzero) digits is 9720, while the sum is 36.

The square root of 80315991 is about 8961.9189351388. The cubic root of 80315991 is about 431.4535110034.

The spelling of 80315991 in words is "eighty million, three hundred fifteen thousand, nine hundred ninety-one".