1312500625 has 10 divisors (see below), whose sum is σ = 1640101562. Its totient is φ = 1050000000.

The previous prime is 1312500571. The next prime is 1312500643. The reversal of 1312500625 is 5260052131.

It can be written as a sum of positive squares in 5 ways, for example, as 112848129 + 1199652496 = 10623^2 + 34636^2 .

It is a de Polignac number, because none of the positive numbers 2^k-1312500625 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1312500625.

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 1049376 + ... + 1050625.

Almost surely, 2^1312500625 is an apocalyptic number.

It is an amenable number.

1312500625 is a deficient number, since it is larger than the sum of its proper divisors (327600937).

1312500625 is an frugal number, since it uses more digits than its factorization.

1312500625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2100021 (or 2100006 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 25.

The square root of 1312500625 is about 36228.4504912921. The cubic root of 1312500625 is about 1094.8799587624.

Adding to 1312500625 its reverse (5260052131), we get a palindrome (6572552756).

The spelling of 1312500625 in words is "one billion, three hundred twelve million, five hundred thousand, six hundred twenty-five".