91570099 has 2 divisors, whose sum is σ = 91570100. Its totient is φ = 91570098.

The previous prime is 91570069. The next prime is 91570103. The reversal of 91570099 is 99007519.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 91570099 - 2⁵ = 91570067 is a prime.

It is not a weakly prime, because it can be changed into another prime (91570069) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45785049 + 45785050.

It is an arithmetic number, because the mean of its divisors is an integer number (45785050).

Almost surely, 2^91570099 is an apocalyptic number.

91570099 is a deficient number, since it is larger than the sum of its proper divisors (1).

91570099 is an equidigital number, since it uses as much as digits as its factorization.

91570099 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 25515, while the sum is 40.

The square root of 91570099 is about 9569.2266667688. The cubic root of 91570099 is about 450.7314835663.

The spelling of 91570099 in words is "ninety-one million, five hundred seventy thousand, ninety-nine".