1231000123 has 4 divisors (see below), whose sum is σ = 1231864200. Its totient is φ = 1230136048.

The previous prime is 1231000109. The next prime is 1231000151. The reversal of 1231000123 is 3210001321.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3210001321 = 1009 ⋅3181369.

It is a cyclic number.

It is not a de Polignac number, because 1231000123 - 2¹⁷ = 1230869051 is a prime.

It is a super-2 number, since 2×1231000123² = 3030722605652030258, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1231000193) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 429898 + ... + 432751.

It is an arithmetic number, because the mean of its divisors is an integer number (307966050).

Almost surely, 2^1231000123 is an apocalyptic number.

1231000123 is a deficient number, since it is larger than the sum of its proper divisors (864077).

1231000123 is an equidigital number, since it uses as much as digits as its factorization.

1231000123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 864076.

The product of its (nonzero) digits is 36, while the sum is 13.

The square root of 1231000123 is about 35085.6113385530. The cubic root of 1231000123 is about 1071.7315902201.

Adding to 1231000123 its reverse (3210001321), we get a palindrome (4441001444).

The spelling of 1231000123 in words is "one billion, two hundred thirty-one million, one hundred twenty-three", and thus it is an aban number.