123000031129 has 4 divisors (see below), whose sum is σ = 123000872320. Its totient is φ = 122999189940.

The previous prime is 123000031127. The next prime is 123000031139. The reversal of 123000031129 is 921130000321.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 123000031129 - 2¹ = 123000031127 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (123000031127) 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, 137949 + ... + 514810.

It is an arithmetic number, because the mean of its divisors is an integer number (30750218080).

Almost surely, 2^123000031129 is an apocalyptic number.

It is an amenable number.

123000031129 is a deficient number, since it is larger than the sum of its proper divisors (841191).

123000031129 is an equidigital number, since it uses as much as digits as its factorization.

123000031129 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 841190.

The product of its (nonzero) digits is 324, while the sum is 22.

It can be divided in two parts, 1230000 and 31129, that added together give a square (1261129 = 1123²).

The spelling of 123000031129 in words is "one hundred twenty-three billion, thirty-one thousand, one hundred twenty-nine".