91297866233 has 4 divisors (see below), whose sum is σ = 104340418560. Its totient is φ = 78255313908.

The previous prime is 91297866217. The next prime is 91297866251. The reversal of 91297866233 is 33266879219.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 91297866233 - 2⁴ = 91297866217 is a prime.

It is a super-2 number, since 2×91297866233² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (91297866203) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6521276153 + ... + 6521276166.

It is an arithmetic number, because the mean of its divisors is an integer number (26085104640).

Almost surely, 2^91297866233 is an apocalyptic number.

It is an amenable number.

91297866233 is a deficient number, since it is larger than the sum of its proper divisors (13042552327).

91297866233 is a wasteful number, since it uses less digits than its factorization.

91297866233 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13042552326.

The product of its digits is 5878656, while the sum is 56.

The spelling of 91297866233 in words is "ninety-one billion, two hundred ninety-seven million, eight hundred sixty-six thousand, two hundred thirty-three".