91318357 has 8 divisors (see below), whose sum is σ = 100742040. Its totient is φ = 82237440.

The previous prime is 91318333. The next prime is 91318379. The reversal of 91318357 is 75381319.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 421201 + 90897156 = 649^2 + 9534^2 .

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 91318357 - 2⁷ = 91318229 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91318457) 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 7 ways as a sum of consecutive naturals, for example, 85132 + ... + 86197.

It is an arithmetic number, because the mean of its divisors is an integer number (12592755).

Almost surely, 2^91318357 is an apocalyptic number.

It is an amenable number.

91318357 is a deficient number, since it is larger than the sum of its proper divisors (9423683).

91318357 is a wasteful number, since it uses less digits than its factorization.

91318357 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 171383.

The product of its digits is 22680, while the sum is 37.

The square root of 91318357 is about 9556.0638863499. The cubic root of 91318357 is about 450.3180582722.

The spelling of 91318357 in words is "ninety-one million, three hundred eighteen thousand, three hundred fifty-seven".