1231403144 has 16 divisors (see below), whose sum is σ = 2326507920. Its totient is φ = 611001040.

The previous prime is 1231403137. The next prime is 1231403161. The reversal of 1231403144 is 4413041321.

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, 586454 + ... + 588549.

It is an arithmetic number, because the mean of its divisors is an integer number (145406745).

Almost surely, 2^1231403144 is an apocalyptic number.

It is an amenable number.

1231403144 is a deficient number, since it is larger than the sum of its proper divisors (1095104776).

1231403144 is a wasteful number, since it uses less digits than its factorization.

1231403144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1175140 (or 1175136 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 23.

The square root of 1231403144 is about 35091.3542628380. The cubic root of 1231403144 is about 1071.8485366500.

Adding to 1231403144 its reverse (4413041321), we get a palindrome (5644444465).

The spelling of 1231403144 in words is "one billion, two hundred thirty-one million, four hundred three thousand, one hundred forty-four".