1231456136 has 16 divisors (see below), whose sum is σ = 2314129500. Its totient is φ = 614354944.

The previous prime is 1231456129. The next prime is 1231456153. The reversal of 1231456136 is 6316541321.

It can be written as a sum of positive squares in 2 ways, for example, as 1155592036 + 75864100 = 33994^2 + 8710^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 167825 + ... + 175008.

Almost surely, 2^1231456136 is an apocalyptic number.

It is an amenable number.

1231456136 is a deficient number, since it is larger than the sum of its proper divisors (1082673364).

1231456136 is a wasteful number, since it uses less digits than its factorization.

1231456136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 343288 (or 343284 counting only the distinct ones).

The product of its digits is 12960, while the sum is 32.

The square root of 1231456136 is about 35092.1093124936. The cubic root of 1231456136 is about 1071.8639116805.

Adding to 1231456136 its reverse (6316541321), we get a palindrome (7547997457).

The spelling of 1231456136 in words is "one billion, two hundred thirty-one million, four hundred fifty-six thousand, one hundred thirty-six".