91165051 has 4 divisors (see below), whose sum is σ = 91249704. Its totient is φ = 91080400.

The previous prime is 91165043. The next prime is 91165121. The reversal of 91165051 is 15056119.

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 91165051 - 2³ = 91165043 is a prime.

It is a super-2 number, since 2×91165051² = 16622133047665202, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91160051) 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, 40690 + ... + 42871.

It is an arithmetic number, because the mean of its divisors is an integer number (22812426).

Almost surely, 2^91165051 is an apocalyptic number.

91165051 is a deficient number, since it is larger than the sum of its proper divisors (84653).

91165051 is a wasteful number, since it uses less digits than its factorization.

91165051 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84652.

The product of its (nonzero) digits is 1350, while the sum is 28.

The square root of 91165051 is about 9548.0391180598. The cubic root of 91165051 is about 450.0659179156.

The spelling of 91165051 in words is "ninety-one million, one hundred sixty-five thousand, fifty-one".