991023032212223 has 4 divisors (see below), whose sum is σ = 991072467211680. Its totient is φ = 990973597212768.

The previous prime is 991023032212211. The next prime is 991023032212229. The reversal of 991023032212223 is 322212230320199.

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 991023032212223 - 2¹⁶ = 991023032146687 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 (991023032212229) 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, 24717469658 + ... + 24717509751.

It is an arithmetic number, because the mean of its divisors is an integer number (247768116802920).

Almost surely, 2^{991023032212223} is an apocalyptic number.

991023032212223 is a deficient number, since it is larger than the sum of its proper divisors (49434999457).

991023032212223 is a wasteful number, since it uses less digits than its factorization.

991023032212223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49434999456.

The product of its (nonzero) digits is 139968, while the sum is 41.

The spelling of 991023032212223 in words is "nine hundred ninety-one trillion, twenty-three billion, thirty-two million, two hundred twelve thousand, two hundred twenty-three".