91900097 has 2 divisors, whose sum is σ = 91900098. Its totient is φ = 91900096.

The previous prime is 91900091. The next prime is 91900117. The reversal of 91900097 is 79000919.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 53348416 + 38551681 = 7304^2 + 6209^2 .

It is a cyclic number.

It is not a de Polignac number, because 91900097 - 2⁶ = 91900033 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (91900091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45950048 + 45950049.

It is an arithmetic number, because the mean of its divisors is an integer number (45950049).

Almost surely, 2^91900097 is an apocalyptic number.

It is an amenable number.

91900097 is a deficient number, since it is larger than the sum of its proper divisors (1).

91900097 is an equidigital number, since it uses as much as digits as its factorization.

91900097 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5103, while the sum is 35.

The square root of 91900097 is about 9586.4538281890. The cubic root of 91900097 is about 451.2722793460.

The spelling of 91900097 in words is "ninety-one million, nine hundred thousand, ninety-seven".