90881 has 4 divisors (see below), whose sum is σ = 103872. Its totient is φ = 77892.

The previous prime is 90863. The next prime is 90887. The reversal of 90881 is 18809.

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: 18809 = 7 ⋅2687.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-90881 is a prime.

It is a super-2 number, since 2×90881² = 16518712322, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 90881.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 90881.

It is not an unprimeable number, because it can be changed into a prime (90887) 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, 6485 + ... + 6498.

It is an arithmetic number, because the mean of its divisors is an integer number (25968).

2⁹⁰⁸⁸¹ is an apocalyptic number.

It is an amenable number.

90881 is a deficient number, since it is larger than the sum of its proper divisors (12991).

90881 is a wasteful number, since it uses less digits than its factorization.

90881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12990.

The product of its (nonzero) digits is 576, while the sum is 26.

The square root of 90881 is about 301.4647574759. The cubic root of 90881 is about 44.9597994887.

It can be divided in two parts, 908 and 81, that added together give a palindrome (989).

The spelling of 90881 in words is "ninety thousand, eight hundred eighty-one".