91997250323 has 4 divisors (see below), whose sum is σ = 100360636728. Its totient is φ = 83633863920.

The previous prime is 91997250227. The next prime is 91997250349. The reversal of 91997250323 is 32305279919.

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 91997250323 - 2⁸ = 91997250067 is a prime.

It is not an unprimeable number, because it can be changed into a prime (91997250823) 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, 4181693186 + ... + 4181693207.

It is an arithmetic number, because the mean of its divisors is an integer number (25090159182).

Almost surely, 2^91997250323 is an apocalyptic number.

91997250323 is a deficient number, since it is larger than the sum of its proper divisors (8363386405).

91997250323 is a wasteful number, since it uses less digits than its factorization.

91997250323 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8363386404.

The product of its (nonzero) digits is 918540, while the sum is 50.

The spelling of 91997250323 in words is "ninety-one billion, nine hundred ninety-seven million, two hundred fifty thousand, three hundred twenty-three".