91471347557 has 8 divisors (see below), whose sum is σ = 95290534080. Its totient is φ = 87727788640.

The previous prime is 91471347523. The next prime is 91471347581. The reversal of 91471347557 is 75574317419.

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 91471347557 - 2⁸ = 91471347301 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 91471347499 and 91471347508.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91471340557) 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, 18904433 + ... + 18909270.

It is an arithmetic number, because the mean of its divisors is an integer number (11911316760).

Almost surely, 2^91471347557 is an apocalyptic number.

It is an amenable number.

91471347557 is a deficient number, since it is larger than the sum of its proper divisors (3819186523).

91471347557 is a wasteful number, since it uses less digits than its factorization.

91471347557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37813803.

The product of its digits is 3704400, while the sum is 53.

The spelling of 91471347557 in words is "ninety-one billion, four hundred seventy-one million, three hundred forty-seven thousand, five hundred fifty-seven".