91885121 has 4 divisors (see below), whose sum is σ = 96721200. Its totient is φ = 87049044.

The previous prime is 91885091. The next prime is 91885127. The reversal of 91885121 is 12158819.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 12158819 = 2621 ⋅4639.

It is a cyclic number.

It is not a de Polignac number, because 91885121 - 2²² = 87690817 is a prime.

It is a super-2 number, since 2×91885121² = 16885750922369282, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91885127) 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, 2418011 + ... + 2418048.

It is an arithmetic number, because the mean of its divisors is an integer number (24180300).

Almost surely, 2^91885121 is an apocalyptic number.

It is an amenable number.

91885121 is a deficient number, since it is larger than the sum of its proper divisors (4836079).

91885121 is a wasteful number, since it uses less digits than its factorization.

91885121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4836078.

The product of its digits is 5760, while the sum is 35.

The square root of 91885121 is about 9585.6726941827. The cubic root of 91885121 is about 451.2477649692.

The spelling of 91885121 in words is "ninety-one million, eight hundred eighty-five thousand, one hundred twenty-one".