91010099 has 4 divisors (see below), whose sum is σ = 91060464. Its totient is φ = 90959736.

The previous prime is 91010093. The next prime is 91010113. The reversal of 91010099 is 99001019.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 91010099 - 2²⁴ = 74232883 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91010093) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22367 + ... + 26120.

It is an arithmetic number, because the mean of its divisors is an integer number (22765116).

Almost surely, 2^91010099 is an apocalyptic number.

91010099 is a deficient number, since it is larger than the sum of its proper divisors (50365).

91010099 is a wasteful number, since it uses less digits than its factorization.

91010099 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50364.

The product of its (nonzero) digits is 729, while the sum is 29.

The square root of 91010099 is about 9539.9213309125. The cubic root of 91010099 is about 449.8107830002.

The spelling of 91010099 in words is "ninety-one million, ten thousand, ninety-nine".