91827431985 has 8 divisors (see below), whose sum is σ = 146923891200. Its totient is φ = 48974630384.

The previous prime is 91827431981. The next prime is 91827432007. The reversal of 91827431985 is 58913472819.

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 91827431985 - 2² = 91827431981 is a prime.

It is not an unprimeable number, because it can be changed into a prime (91827431981) 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, 3060914385 + ... + 3060914414.

It is an arithmetic number, because the mean of its divisors is an integer number (18365486400).

Almost surely, 2^91827431985 is an apocalyptic number.

It is an amenable number.

91827431985 is a deficient number, since it is larger than the sum of its proper divisors (55096459215).

91827431985 is a wasteful number, since it uses less digits than its factorization.

91827431985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6121828807.

The product of its digits is 4354560, while the sum is 57.

The spelling of 91827431985 in words is "ninety-one billion, eight hundred twenty-seven million, four hundred thirty-one thousand, nine hundred eighty-five".