91942881 has 8 divisors (see below), whose sum is σ = 129042720. Its totient is φ = 58069152.

The previous prime is 91942859. The next prime is 91942883. The reversal of 91942881 is 18824919.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 91942881 - 2⁹ = 91942369 is a prime.

It is a super-2 number, since 2×91942881² = 16906986733160322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (91942883) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 806460 + ... + 806573.

It is an arithmetic number, because the mean of its divisors is an integer number (16130340).

Almost surely, 2^91942881 is an apocalyptic number.

It is an amenable number.

91942881 is a deficient number, since it is larger than the sum of its proper divisors (37099839).

91942881 is a wasteful number, since it uses less digits than its factorization.

91942881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1613055.

The product of its digits is 41472, while the sum is 42.

The square root of 91942881 is about 9588.6850506209. The cubic root of 91942881 is about 451.3422982703.

The spelling of 91942881 in words is "ninety-one million, nine hundred forty-two thousand, eight hundred eighty-one".