1312510644 has 18 divisors (see below), whose sum is σ = 3317735330. Its totient is φ = 437503536.

The previous prime is 1312510631. The next prime is 1312510649. The reversal of 1312510644 is 4460152131.

It is a happy number.

1312510644 is a `hidden beast` number, since 1 + 3 + 1 + 2 + 5 + 10 + 644 = 666.

1312510644 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 1009332900 + 303177744 = 31770^2 + 17412^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a super-2 number, since 2×1312510644² = 3445368381226589472, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1312510649) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 18229279 + ... + 18229350.

Almost surely, 2^1312510644 is an apocalyptic number.

It is an amenable number.

1312510644 is an abundant number, since it is smaller than the sum of its proper divisors (2005224686).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1312510644 is a wasteful number, since it uses less digits than its factorization.

1312510644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36458639 (or 36458634 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

The square root of 1312510644 is about 36228.5887663320. The cubic root of 1312510644 is about 1094.8827446847.

Adding to 1312510644 its reverse (4460152131), we get a palindrome (5772662775).

The spelling of 1312510644 in words is "one billion, three hundred twelve million, five hundred ten thousand, six hundred forty-four".