991130424223 has 4 divisors (see below), whose sum is σ = 1003676379040. Its totient is φ = 978584469408.

The previous prime is 991130424209. The next prime is 991130424329. The reversal of 991130424223 is 322424031199.

It is a happy number.

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 991130424223 - 2¹⁷ = 991130293151 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 (991130424023) 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, 6272977290 + ... + 6272977447.

It is an arithmetic number, because the mean of its divisors is an integer number (250919094760).

Almost surely, 2^991130424223 is an apocalyptic number.

991130424223 is a deficient number, since it is larger than the sum of its proper divisors (12545954817).

991130424223 is a wasteful number, since it uses less digits than its factorization.

991130424223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12545954816.

The product of its (nonzero) digits is 93312, while the sum is 40.

The spelling of 991130424223 in words is "nine hundred ninety-one billion, one hundred thirty million, four hundred twenty-four thousand, two hundred twenty-three".