91273881 has 4 divisors (see below), whose sum is σ = 121698512. Its totient is φ = 60849252.

The previous prime is 91273841. The next prime is 91273883. The reversal of 91273881 is 18837219.

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.

It is not a de Polignac number, because 91273881 - 2¹⁴ = 91257497 is a prime.

It is a super-2 number, since 2×91273881² = 16661842705604322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91273883) 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, 15212311 + ... + 15212316.

It is an arithmetic number, because the mean of its divisors is an integer number (30424628).

Almost surely, 2^91273881 is an apocalyptic number.

It is an amenable number.

91273881 is a deficient number, since it is larger than the sum of its proper divisors (30424631).

91273881 is a wasteful number, since it uses less digits than its factorization.

91273881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30424630.

The product of its digits is 24192, while the sum is 39.

The square root of 91273881 is about 9553.7364941681. The cubic root of 91273881 is about 450.2449382591.

The spelling of 91273881 in words is "ninety-one million, two hundred seventy-three thousand, eight hundred eighty-one".