80691187 has 2 divisors, whose sum is σ = 80691188. Its totient is φ = 80691186.

The previous prime is 80691181. The next prime is 80691203. The reversal of 80691187 is 78119608.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 80691187 - 2⁷ = 80691059 is a prime.

It is a super-2 number, since 2×80691187² = 13022135318937938, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (80691181) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40345593 + 40345594.

It is an arithmetic number, because the mean of its divisors is an integer number (40345594).

Almost surely, 2^80691187 is an apocalyptic number.

80691187 is a deficient number, since it is larger than the sum of its proper divisors (1).

80691187 is an equidigital number, since it uses as much as digits as its factorization.

80691187 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24192, while the sum is 40.

The square root of 80691187 is about 8982.8273388728. The cubic root of 80691187 is about 432.1243122897.

The spelling of 80691187 in words is "eighty million, six hundred ninety-one thousand, one hundred eighty-seven".