91318381 has 8 divisors (see below), whose sum is σ = 113851584. Its totient is φ = 71157120.

The previous prime is 91318379. The next prime is 91318393. The reversal of 91318381 is 18381319.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 91318381 - 2¹ = 91318379 is a prime.

It is a super-2 number, since 2×91318381² = 16678093416922322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91318081) 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, 592900 + ... + 593053.

It is an arithmetic number, because the mean of its divisors is an integer number (14231448).

Almost surely, 2^91318381 is an apocalyptic number.

It is an amenable number.

91318381 is a deficient number, since it is larger than the sum of its proper divisors (22533203).

91318381 is a wasteful number, since it uses less digits than its factorization.

91318381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1185971.

The product of its digits is 5184, while the sum is 34.

The square root of 91318381 is about 9556.0651420969. The cubic root of 91318381 is about 450.3180977226.

The spelling of 91318381 in words is "ninety-one million, three hundred eighteen thousand, three hundred eighty-one".