1231353123 has 128 divisors (see below), whose sum is σ = 2305787904. Its totient is φ = 564019200.

The previous prime is 1231353119. The next prime is 1231353131. The reversal of 1231353123 is 3213531321.

It is not a de Polignac number, because 1231353123 - 2² = 1231353119 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1231353093 and 1231353102.

It is not an unprimeable number, because it can be changed into a prime (1231353103) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 8987911 + ... + 8988047.

It is an arithmetic number, because the mean of its divisors is an integer number (18013968).

Almost surely, 2^1231353123 is an apocalyptic number.

1231353123 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

1231353123 is a deficient number, since it is larger than the sum of its proper divisors (1074434781).

1231353123 is a wasteful number, since it uses less digits than its factorization.

1231353123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 285.

The product of its digits is 1620, while the sum is 24.

The square root of 1231353123 is about 35090.6415301858. The cubic root of 1231353123 is about 1071.8340232168.

Adding to 1231353123 its reverse (3213531321), we get a palindrome (4444884444).

The spelling of 1231353123 in words is "one billion, two hundred thirty-one million, three hundred fifty-three thousand, one hundred twenty-three".