1315644625 has 16 divisors (see below), whose sum is σ = 1644786000. Its totient is φ = 1050681600.

The previous prime is 1315644587. The next prime is 1315644661. The reversal of 1315644625 is 5264465131.

It can be written as a sum of positive squares in 8 ways, for example, as 700555024 + 615089601 = 26468^2 + 24801^2 .

It is not a de Polignac number, because 1315644625 - 2¹³ = 1315636433 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 65251 + ... + 82999.

It is an arithmetic number, because the mean of its divisors is an integer number (102799125).

Almost surely, 2^1315644625 is an apocalyptic number.

It is an amenable number.

1315644625 is a deficient number, since it is larger than the sum of its proper divisors (329141375).

1315644625 is an equidigital number, since it uses as much as digits as its factorization.

1315644625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18357 (or 18347 counting only the distinct ones).

The product of its digits is 86400, while the sum is 37.

The square root of 1315644625 is about 36271.8158492238. The cubic root of 1315644625 is about 1095.7534967964.

The spelling of 1315644625 in words is "one billion, three hundred fifteen million, six hundred forty-four thousand, six hundred twenty-five".