91834786957 has 4 divisors (see below), whose sum is σ = 92781537436. Its totient is φ = 90888036480.

The previous prime is 91834786933. The next prime is 91834786961. The reversal of 91834786957 is 75968743819.

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

It can be written as a sum of positive squares in 2 ways, for example, as 64295716356 + 27539070601 = 253566^2 + 165949^2 .

It is a cyclic number.

It is not a de Polignac number, because 91834786957 - 2⁷ = 91834786829 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 91834786892 and 91834786901.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91834789957) 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, 473375094 + ... + 473375287.

It is an arithmetic number, because the mean of its divisors is an integer number (23195384359).

Almost surely, 2^91834786957 is an apocalyptic number.

91834786957 is a gapful number since it is divisible by the number (97) formed by its first and last digit.

It is an amenable number.

91834786957 is a deficient number, since it is larger than the sum of its proper divisors (946750479).

91834786957 is an equidigital number, since it uses as much as digits as its factorization.

91834786957 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 946750478.

The product of its digits is 91445760, while the sum is 67.

The spelling of 91834786957 in words is "ninety-one billion, eight hundred thirty-four million, seven hundred eighty-six thousand, nine hundred fifty-seven".