1231355144 has 32 divisors (see below), whose sum is σ = 2341003680. Its totient is φ = 607140864.

The previous prime is 1231355143. The next prime is 1231355149. The reversal of 1231355144 is 4415531321.

It is not an unprimeable number, because it can be changed into a prime (1231355143) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 191144 + ... + 197480.

It is an arithmetic number, because the mean of its divisors is an integer number (73156365).

Almost surely, 2^1231355144 is an apocalyptic number.

It is an amenable number.

1231355144 is a deficient number, since it is larger than the sum of its proper divisors (1109648536).

1231355144 is a wasteful number, since it uses less digits than its factorization.

1231355144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6677 (or 6673 counting only the distinct ones).

The product of its digits is 7200, while the sum is 29.

The square root of 1231355144 is about 35090.6703270257. The cubic root of 1231355144 is about 1071.8346096111.

Adding to 1231355144 its reverse (4415531321), we get a palindrome (5646886465).

The spelling of 1231355144 in words is "one billion, two hundred thirty-one million, three hundred fifty-five thousand, one hundred forty-four".