1231302123 has 6 divisors (see below), whose sum is σ = 1778547524. Its totient is φ = 820868076.

The previous prime is 1231302073. The next prime is 1231302131. The reversal of 1231302123 is 3212031321.

It is not a de Polignac number, because 1231302123 - 2²⁰ = 1230253547 is a prime.

It is a super-2 number, since 2×1231302123² = 3032209836208614258, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1231302096 and 1231302105.

It is not an unprimeable number, because it can be changed into a prime (1231302133) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 68405665 + ... + 68405682.

Almost surely, 2^1231302123 is an apocalyptic number.

1231302123 is a deficient number, since it is larger than the sum of its proper divisors (547245401).

1231302123 is a wasteful number, since it uses less digits than its factorization.

1231302123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 136811353 (or 136811350 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

The square root of 1231302123 is about 35089.9148331825. The cubic root of 1231302123 is about 1071.8192253253.

Adding to 1231302123 its reverse (3212031321), we get a palindrome (4443333444).

The spelling of 1231302123 in words is "one billion, two hundred thirty-one million, three hundred two thousand, one hundred twenty-three".