1231200123 has 64 divisors (see below), whose sum is σ = 1825984512. Its totient is φ = 735920640.

The previous prime is 1231200119. The next prime is 1231200151. The reversal of 1231200123 is 3210021321.

It is not a de Polignac number, because 1231200123 - 2² = 1231200119 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1231200623) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 7841961 + ... + 7842117.

It is an arithmetic number, because the mean of its divisors is an integer number (28531008).

Almost surely, 2^1231200123 is an apocalyptic number.

1231200123 is a deficient number, since it is larger than the sum of its proper divisors (594784389).

1231200123 is a wasteful number, since it uses less digits than its factorization.

1231200123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 324.

The product of its (nonzero) digits is 72, while the sum is 15.

The square root of 1231200123 is about 35088.4613940252. The cubic root of 1231200123 is about 1071.7896283163.

Adding to 1231200123 its reverse (3210021321), we get a palindrome (4441221444).

The spelling of 1231200123 in words is "one billion, two hundred thirty-one million, two hundred thousand, one hundred twenty-three".