1321312144 has 10 divisors (see below), whose sum is σ = 2560042310. Its totient is φ = 660656064.

The previous prime is 1321312141. The next prime is 1321312147. The reversal of 1321312144 is 4412131231.

It is an interprime number because it is at equal distance from previous prime (1321312141) and next prime (1321312147).

It can be written as a sum of positive squares in only one way, i.e., 1129766544 + 191545600 = 33612^2 + 13840^2 .

It is not an unprimeable number, because it can be changed into a prime (1321312141) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41290989 + ... + 41291020.

It is an arithmetic number, because the mean of its divisors is an integer number (256004231).

Almost surely, 2^1321312144 is an apocalyptic number.

It is an amenable number.

1321312144 is a deficient number, since it is larger than the sum of its proper divisors (1238730166).

1321312144 is an equidigital number, since it uses as much as digits as its factorization.

1321312144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82582017 (or 82582011 counting only the distinct ones).

The product of its digits is 576, while the sum is 22.

The square root of 1321312144 is about 36349.8575513027. The cubic root of 1321312144 is about 1097.3246676911.

Adding to 1321312144 its reverse (4412131231), we get a palindrome (5733443375).

The spelling of 1321312144 in words is "one billion, three hundred twenty-one million, three hundred twelve thousand, one hundred forty-four".