91571667923 has 8 divisors (see below), whose sum is σ = 92806353600. Its totient is φ = 90338871168.

The previous prime is 91571667841. The next prime is 91571667953. The reversal of 91571667923 is 32976617519.

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 91571667923 - 2²² = 91567473619 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91571667953) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 374486 + ... + 568667.

It is an arithmetic number, because the mean of its divisors is an integer number (11600794200).

Almost surely, 2^91571667923 is an apocalyptic number.

91571667923 is a deficient number, since it is larger than the sum of its proper divisors (1234685677).

91571667923 is a wasteful number, since it uses less digits than its factorization.

91571667923 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 944461.

The product of its digits is 4286520, while the sum is 56.

The spelling of 91571667923 in words is "ninety-one billion, five hundred seventy-one million, six hundred sixty-seven thousand, nine hundred twenty-three".