91232738681 has 8 divisors (see below), whose sum is σ = 104268891840. Its totient is φ = 78197311728.

The previous prime is 91232738677. The next prime is 91232738693. The reversal of 91232738681 is 18683723219.

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 91232738681 - 2² = 91232738677 is a prime.

It is a super-2 number, since 2×91232738681² (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 (91232738621) 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, 121355 + ... + 444063.

It is an arithmetic number, because the mean of its divisors is an integer number (13033611480).

Almost surely, 2^91232738681 is an apocalyptic number.

It is an amenable number.

91232738681 is a deficient number, since it is larger than the sum of its proper divisors (13036153159).

91232738681 is a wasteful number, since it uses less digits than its factorization.

91232738681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 363103.

The product of its digits is 870912, while the sum is 50.

The spelling of 91232738681 in words is "ninety-one billion, two hundred thirty-two million, seven hundred thirty-eight thousand, six hundred eighty-one".