91477691589 has 8 divisors (see below), whose sum is σ = 121971764992. Its totient is φ = 60984372960.

The previous prime is 91477691581. The next prime is 91477691633. The reversal of 91477691589 is 98519677419.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 91477691589 - 2³ = 91477691581 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91477691581) 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, 221484 + ... + 481674.

It is an arithmetic number, because the mean of its divisors is an integer number (15246470624).

Almost surely, 2^91477691589 is an apocalyptic number.

It is an amenable number.

91477691589 is a deficient number, since it is larger than the sum of its proper divisors (30494073403).

91477691589 is a wasteful number, since it uses less digits than its factorization.

91477691589 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 377387.

The product of its digits is 34292160, while the sum is 66.

The spelling of 91477691589 in words is "ninety-one billion, four hundred seventy-seven million, six hundred ninety-one thousand, five hundred eighty-nine".