91252991 has 16 divisors (see below), whose sum is σ = 103887360. Its totient is φ = 79620480.

The previous prime is 91252981. The next prime is 91253023. The reversal of 91252991 is 19925219.

It is a cyclic number.

It is not a de Polignac number, because 91252991 - 2⁶ = 91252927 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91252981) 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, 12176 + ... + 18186.

It is an arithmetic number, because the mean of its divisors is an integer number (6492960).

Almost surely, 2^91252991 is an apocalyptic number.

91252991 is a deficient number, since it is larger than the sum of its proper divisors (12634369).

91252991 is a wasteful number, since it uses less digits than its factorization.

91252991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6094.

The product of its digits is 14580, while the sum is 38.

The square root of 91252991 is about 9552.6431420838. The cubic root of 91252991 is about 450.2105862104.

The spelling of 91252991 in words is "ninety-one million, two hundred fifty-two thousand, nine hundred ninety-one".