91813010681 has 16 divisors (see below), whose sum is σ = 107052933120. Its totient is φ = 77116335120.

The previous prime is 91813010579. The next prime is 91813010689. The reversal of 91813010681 is 18601031819.

It is a cyclic number.

It is not a de Polignac number, because 91813010681 - 2²⁶ = 91745901817 is a prime.

It is a super-2 number, since 2×91813010681² (a number of 23 digits) contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (91813010689) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 422891 + ... + 602048.

It is an arithmetic number, because the mean of its divisors is an integer number (6690808320).

Almost surely, 2^91813010681 is an apocalyptic number.

It is an amenable number.

91813010681 is a deficient number, since it is larger than the sum of its proper divisors (15239922439).

91813010681 is a wasteful number, since it uses less digits than its factorization.

91813010681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1025204.

The product of its (nonzero) digits is 10368, while the sum is 38.

The spelling of 91813010681 in words is "ninety-one billion, eight hundred thirteen million, ten thousand, six hundred eighty-one".