1231172123 has 8 divisors (see below), whose sum is σ = 1244763936. Its totient is φ = 1217608000.

The previous prime is 1231172069. The next prime is 1231172153. The reversal of 1231172123 is 3212711321.

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

It is a cyclic number.

It is not a de Polignac number, because 1231172123 - 2²² = 1226977819 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1231172153) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 89858 + ... + 102648.

It is an arithmetic number, because the mean of its divisors is an integer number (155595492).

Almost surely, 2^1231172123 is an apocalyptic number.

1231172123 is a deficient number, since it is larger than the sum of its proper divisors (13591813).

1231172123 is a wasteful number, since it uses less digits than its factorization.

1231172123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13845.

The product of its digits is 504, while the sum is 23.

The square root of 1231172123 is about 35088.0624001953. The cubic root of 1231172123 is about 1071.7815033612.

Adding to 1231172123 its reverse (3212711321), we get a palindrome (4443883444).

The spelling of 1231172123 in words is "one billion, two hundred thirty-one million, one hundred seventy-two thousand, one hundred twenty-three".