123231891 has 8 divisors (see below), whose sum is σ = 172957120. Its totient is φ = 77830632.

The previous prime is 123231887. The next prime is 123231893. The reversal of 123231891 is 198132321.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 123231891 - 2² = 123231887 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (123231893) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1080925 + ... + 1081038.

It is an arithmetic number, because the mean of its divisors is an integer number (21619640).

Almost surely, 2^123231891 is an apocalyptic number.

123231891 is a deficient number, since it is larger than the sum of its proper divisors (49725229).

123231891 is a wasteful number, since it uses less digits than its factorization.

123231891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2161985.

The product of its digits is 2592, while the sum is 30.

The square root of 123231891 is about 11100.9860372852. The cubic root of 123231891 is about 497.6313177419.

The spelling of 123231891 in words is "one hundred twenty-three million, two hundred thirty-one thousand, eight hundred ninety-one".