91083281 has 4 divisors (see below), whose sum is σ = 91291200. Its totient is φ = 90875364.

The previous prime is 91083277. The next prime is 91083319. The reversal of 91083281 is 18238019.

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: 18238019 = 79 ⋅230861.

It is a cyclic number.

It is not a de Polignac number, because 91083281 - 2² = 91083277 is a prime.

It is a super-2 number, since 2×91083281² = 16592328155449922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91083221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 103301 + ... + 104178.

It is an arithmetic number, because the mean of its divisors is an integer number (22822800).

Almost surely, 2^91083281 is an apocalyptic number.

It is an amenable number.

91083281 is a deficient number, since it is larger than the sum of its proper divisors (207919).

91083281 is a wasteful number, since it uses less digits than its factorization.

91083281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 207918.

The product of its (nonzero) digits is 3456, while the sum is 32.

The square root of 91083281 is about 9543.7561263897. The cubic root of 91083281 is about 449.9313162663.

The spelling of 91083281 in words is "ninety-one million, eighty-three thousand, two hundred eighty-one".