91810973347 has 4 divisors (see below), whose sum is σ = 97211618856. Its totient is φ = 86410327840.

The previous prime is 91810973323. The next prime is 91810973369. The reversal of 91810973347 is 74337901819.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 91810973347 - 2²³ = 91802584739 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 91810973294 and 91810973303.

It is not an unprimeable number, because it can be changed into a prime (91810973377) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2700322729 + ... + 2700322762.

It is an arithmetic number, because the mean of its divisors is an integer number (24302904714).

Almost surely, 2^91810973347 is an apocalyptic number.

91810973347 is a deficient number, since it is larger than the sum of its proper divisors (5400645509).

91810973347 is a wasteful number, since it uses less digits than its factorization.

91810973347 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5400645508.

The product of its (nonzero) digits is 1143072, while the sum is 52.

The spelling of 91810973347 in words is "ninety-one billion, eight hundred ten million, nine hundred seventy-three thousand, three hundred forty-seven".