91391348671 has 4 divisors (see below), whose sum is σ = 104447255632. Its totient is φ = 78335441712.

The previous prime is 91391348621. The next prime is 91391348683. The reversal of 91391348671 is 17684319319.

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 91391348671 - 2¹¹ = 91391346623 is a prime.

It is a super-2 number, since 2×91391348671² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91391348621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6527953470 + ... + 6527953483.

It is an arithmetic number, because the mean of its divisors is an integer number (26111813908).

Almost surely, 2^91391348671 is an apocalyptic number.

91391348671 is a deficient number, since it is larger than the sum of its proper divisors (13055906961).

91391348671 is a wasteful number, since it uses less digits than its factorization.

91391348671 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13055906960.

The product of its digits is 979776, while the sum is 52.

The spelling of 91391348671 in words is "ninety-one billion, three hundred ninety-one million, three hundred forty-eight thousand, six hundred seventy-one".