91857133153 has 4 divisors (see below), whose sum is σ = 91868808388. Its totient is φ = 91845457920.

The previous prime is 91857133133. The next prime is 91857133163. The reversal of 91857133153 is 35133175819.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 35133175819 = 7 ⋅5019025117.

It can be written as a sum of positive squares in 2 ways, for example, as 5519301264 + 86337831889 = 74292^2 + 293833^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-91857133153 is a prime.

It is a super-2 number, since 2×91857133153² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91857133133) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5825808 + ... + 5841553.

It is an arithmetic number, because the mean of its divisors is an integer number (22967202097).

Almost surely, 2^91857133153 is an apocalyptic number.

It is an amenable number.

91857133153 is a deficient number, since it is larger than the sum of its proper divisors (11675235).

91857133153 is a wasteful number, since it uses less digits than its factorization.

91857133153 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11675234.

The product of its digits is 340200, while the sum is 46.

The spelling of 91857133153 in words is "ninety-one billion, eight hundred fifty-seven million, one hundred thirty-three thousand, one hundred fifty-three".