91312398847 has 4 divisors (see below), whose sum is σ = 91323615096. Its totient is φ = 91301182600.

The previous prime is 91312398841. The next prime is 91312398899. The reversal of 91312398847 is 74889321319.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 74889321319 = 223 ⋅335826553.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-91312398847 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 (91312398841) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5595904 + ... + 5612197.

It is an arithmetic number, because the mean of its divisors is an integer number (22830903774).

Almost surely, 2^91312398847 is an apocalyptic number.

91312398847 is a deficient number, since it is larger than the sum of its proper divisors (11216249).

91312398847 is a wasteful number, since it uses less digits than its factorization.

91312398847 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11216248.

The product of its digits is 2612736, while the sum is 55.

The spelling of 91312398847 in words is "ninety-one billion, three hundred twelve million, three hundred ninety-eight thousand, eight hundred forty-seven".