91199121 has 16 divisors (see below), whose sum is σ = 131288640. Its totient is φ = 55978560.

The previous prime is 91199111. The next prime is 91199131. The reversal of 91199121 is 12199119.

It is an interprime number because it is at equal distance from previous prime (91199111) and next prime (91199131).

It is not a de Polignac number, because 91199121 - 2⁵ = 91199089 is a prime.

It is not an unprimeable number, because it can be changed into a prime (91199111) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13551 + ... + 19131.

It is an arithmetic number, because the mean of its divisors is an integer number (8205540).

Almost surely, 2^91199121 is an apocalyptic number.

It is an amenable number.

91199121 is a deficient number, since it is larger than the sum of its proper divisors (40089519).

91199121 is a wasteful number, since it uses less digits than its factorization.

91199121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6016.

The product of its digits is 1458, while the sum is 33.

The square root of 91199121 is about 9549.8230873666. The cubic root of 91199121 is about 450.1219768106.

The spelling of 91199121 in words is "ninety-one million, one hundred ninety-nine thousand, one hundred twenty-one".