1231365123 has 6 divisors (see below), whose sum is σ = 1778638524. Its totient is φ = 820910076.

The previous prime is 1231365101. The next prime is 1231365133. The reversal of 1231365123 is 3215631321.

1231365123 is a `hidden beast` number, since 1 + 2 + 3 + 1 + 3 + 651 + 2 + 3 = 666.

It is not a de Polignac number, because 1231365123 - 2³⁰ = 157623299 is a prime.

It is a super-2 number, since 2×1231365123² = 3032520132281610258, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1231365133) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 68409165 + ... + 68409182.

It is an arithmetic number, because the mean of its divisors is an integer number (296439754).

Almost surely, 2^1231365123 is an apocalyptic number.

1231365123 is a deficient number, since it is larger than the sum of its proper divisors (547273401).

1231365123 is a wasteful number, since it uses less digits than its factorization.

1231365123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136818353 (or 136818350 counting only the distinct ones).

The product of its digits is 3240, while the sum is 27.

The square root of 1231365123 is about 35090.8125155289. The cubic root of 1231365123 is about 1071.8375050143.

Adding to 1231365123 its reverse (3215631321), we get a palindrome (4446996444).

The spelling of 1231365123 in words is "one billion, two hundred thirty-one million, three hundred sixty-five thousand, one hundred twenty-three".