80005091 has 2 divisors, whose sum is σ = 80005092. Its totient is φ = 80005090.

The previous prime is 80005087. The next prime is 80005097. The reversal of 80005091 is 19050008.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 80005091 - 2² = 80005087 is a prime.

It is not a weakly prime, because it can be changed into another prime (80005097) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40002545 + 40002546.

It is an arithmetic number, because the mean of its divisors is an integer number (40002546).

Almost surely, 2^80005091 is an apocalyptic number.

80005091 is a deficient number, since it is larger than the sum of its proper divisors (1).

80005091 is an equidigital number, since it uses as much as digits as its factorization.

80005091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 360, while the sum is 23.

The square root of 80005091 is about 8944.5565010234. The cubic root of 80005091 is about 430.8960780017.

Adding to 80005091 its reverse (19050008), we get a palindrome (99055099).

The spelling of 80005091 in words is "eighty million, five thousand, ninety-one".