1231540144 has 10 divisors (see below), whose sum is σ = 2386109060. Its totient is φ = 615770064.

The previous prime is 1231540133. The next prime is 1231540151. The reversal of 1231540144 is 4410451321.

It is a super-2 number, since 2×1231540144² = 3033382252567081472, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38485614 + ... + 38485645.

It is an arithmetic number, because the mean of its divisors is an integer number (238610906).

Almost surely, 2^1231540144 is an apocalyptic number.

It is an amenable number.

1231540144 is a deficient number, since it is larger than the sum of its proper divisors (1154568916).

1231540144 is an equidigital number, since it uses as much as digits as its factorization.

1231540144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76971267 (or 76971261 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 25.

The square root of 1231540144 is about 35093.3062563219. The cubic root of 1231540144 is about 1071.8882847495. Note that the first 3 decimals are identical.

Adding to 1231540144 its reverse (4410451321), we get a palindrome (5641991465).

The spelling of 1231540144 in words is "one billion, two hundred thirty-one million, five hundred forty thousand, one hundred forty-four".