991682423 has 4 divisors (see below), whose sum is σ = 1003630488. Its totient is φ = 979734360.

The previous prime is 991682413. The next prime is 991682449. The reversal of 991682423 is 324286199.

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 991682423 - 2⁴ = 991682407 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 (991682413) 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, 5973908 + ... + 5974073.

It is an arithmetic number, because the mean of its divisors is an integer number (250907622).

Almost surely, 2^991682423 is an apocalyptic number.

991682423 is a deficient number, since it is larger than the sum of its proper divisors (11948065).

991682423 is a wasteful number, since it uses less digits than its factorization.

991682423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11948064.

The product of its digits is 186624, while the sum is 44.

The square root of 991682423 is about 31490.9895525688. The cubic root of 991682423 is about 997.2197517164.

The spelling of 991682423 in words is "nine hundred ninety-one million, six hundred eighty-two thousand, four hundred twenty-three".