91914881 has 4 divisors (see below), whose sum is σ = 92381652. Its totient is φ = 91448112.

The previous prime is 91914871. The next prime is 91914883. The reversal of 91914881 is 18841919.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 88529281 + 3385600 = 9409^2 + 1840^2 .

It is a cyclic number.

It is not a de Polignac number, because 91914881 - 2²⁶ = 24806017 is a prime.

It is a super-2 number, since 2×91914881² = 16896690698488322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91914883) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 233090 + ... + 233483.

It is an arithmetic number, because the mean of its divisors is an integer number (23095413).

Almost surely, 2^91914881 is an apocalyptic number.

It is an amenable number.

91914881 is a deficient number, since it is larger than the sum of its proper divisors (466771).

91914881 is a wasteful number, since it uses less digits than its factorization.

91914881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 466770.

The product of its digits is 20736, while the sum is 41.

The square root of 91914881 is about 9587.2248852314. The cubic root of 91914881 is about 451.2964768237.

The spelling of 91914881 in words is "ninety-one million, nine hundred fourteen thousand, eight hundred eighty-one".