1312801973 has 20 divisors (see below), whose sum is σ = 1535698668. Its totient is φ = 1122186240.

The previous prime is 1312801967. The next prime is 1312801991. The reversal of 1312801973 is 3791082131.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 607474609 + 705327364 = 24647^2 + 26558^2 .

It is not a de Polignac number, because 1312801973 - 2⁶ = 1312801909 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1312801943) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 1538615 + ... + 1539467.

Almost surely, 2^1312801973 is an apocalyptic number.

It is an amenable number.

1312801973 is a deficient number, since it is larger than the sum of its proper divisors (222896695).

1312801973 is an frugal number, since it uses more digits than its factorization.

1312801973 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1522 (or 1501 counting only the distinct ones).

The product of its (nonzero) digits is 9072, while the sum is 35.

The square root of 1312801973 is about 36232.6092491281. The cubic root of 1312801973 is about 1094.9637465670.

The spelling of 1312801973 in words is "one billion, three hundred twelve million, eight hundred one thousand, nine hundred seventy-three".