99901091 has 2 divisors, whose sum is σ = 99901092. Its totient is φ = 99901090.

The previous prime is 99901079. The next prime is 99901097. The reversal of 99901091 is 19010999.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-99901091 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (99901097) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49950545 + 49950546.

It is an arithmetic number, because the mean of its divisors is an integer number (49950546).

Almost surely, 2^99901091 is an apocalyptic number.

99901091 is a deficient number, since it is larger than the sum of its proper divisors (1).

99901091 is an equidigital number, since it uses as much as digits as its factorization.

99901091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6561, while the sum is 38.

The square root of 99901091 is about 9995.0533265211. The cubic root of 99901091 is about 464.0058012429.

The spelling of 99901091 in words is "ninety-nine million, nine hundred one thousand, ninety-one".