91693892321 has 4 divisors (see below), whose sum is σ = 91720373952. Its totient is φ = 91667410692.

The previous prime is 91693892309. The next prime is 91693892393. The reversal of 91693892321 is 12329839619.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-91693892321 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91693892621) 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 3 ways as a sum of consecutive naturals, for example, 13235621 + ... + 13242546.

It is an arithmetic number, because the mean of its divisors is an integer number (22930093488).

Almost surely, 2^91693892321 is an apocalyptic number.

It is an amenable number.

91693892321 is a deficient number, since it is larger than the sum of its proper divisors (26481631).

91693892321 is a wasteful number, since it uses less digits than its factorization.

91693892321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26481630.

The product of its digits is 1259712, while the sum is 53.

The spelling of 91693892321 in words is "ninety-one billion, six hundred ninety-three million, eight hundred ninety-two thousand, three hundred twenty-one".