91127021 has 8 divisors (see below), whose sum is σ = 101566080. Its totient is φ = 81252288.

The previous prime is 91127017. The next prime is 91127027. The reversal of 91127021 is 12072119.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 91127021 - 2² = 91127017 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 (91127027) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 140741 + ... + 141386.

It is an arithmetic number, because the mean of its divisors is an integer number (12695760).

Almost surely, 2^91127021 is an apocalyptic number.

It is an amenable number.

91127021 is a deficient number, since it is larger than the sum of its proper divisors (10439059).

91127021 is a wasteful number, since it uses less digits than its factorization.

91127021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 282163.

The product of its (nonzero) digits is 252, while the sum is 23.

The square root of 91127021 is about 9546.0474019355. The cubic root of 91127021 is about 450.0033267244.

The spelling of 91127021 in words is "ninety-one million, one hundred twenty-seven thousand, twenty-one".