80400091 has 2 divisors, whose sum is σ = 80400092. Its totient is φ = 80400090.

The previous prime is 80400059. The next prime is 80400097. The reversal of 80400091 is 19000408.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 80400091 - 2⁵ = 80400059 is a prime.

It is not a weakly prime, because it can be changed into another prime (80400097) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40200045 + 40200046.

It is an arithmetic number, because the mean of its divisors is an integer number (40200046).

Almost surely, 2^80400091 is an apocalyptic number.

80400091 is a deficient number, since it is larger than the sum of its proper divisors (1).

80400091 is an equidigital number, since it uses as much as digits as its factorization.

80400091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 288, while the sum is 22.

The square root of 80400091 is about 8966.6097829670. The cubic root of 80400091 is about 431.6040521442.

Adding to 80400091 its reverse (19000408), we get a palindrome (99400499).

The spelling of 80400091 in words is "eighty million, four hundred thousand, ninety-one".