91917312523 has 8 divisors (see below), whose sum is σ = 92477968128. Its totient is φ = 91356779304.

The previous prime is 91917312503. The next prime is 91917312581. The reversal of 91917312523 is 32521371919.

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 91917312523 - 2¹³ = 91917304331 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 91917312523.

It is not an unprimeable number, because it can be changed into a prime (91917312503) 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, 1812490 + ... + 1862512.

It is an arithmetic number, because the mean of its divisors is an integer number (11559746016).

Almost surely, 2^91917312523 is an apocalyptic number.

91917312523 is a deficient number, since it is larger than the sum of its proper divisors (560655605).

91917312523 is a wasteful number, since it uses less digits than its factorization.

91917312523 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61193.

The product of its digits is 102060, while the sum is 43.

The spelling of 91917312523 in words is "ninety-one billion, nine hundred seventeen million, three hundred twelve thousand, five hundred twenty-three".