1256938825 has 18 divisors (see below), whose sum is σ = 1644965214. Its totient is φ = 952620480.

The previous prime is 1256938817. The next prime is 1256938829. The reversal of 1256938825 is 5288396521.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 414081801 + 842857024 = 20349^2 + 29032^2 .

It is not a de Polignac number, because 1256938825 - 2³ = 1256938817 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1256938829) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 60612 + ... + 78661.

Almost surely, 2^1256938825 is an apocalyptic number.

It is an amenable number.

1256938825 is a deficient number, since it is larger than the sum of its proper divisors (388026389).

1256938825 is a wasteful number, since it uses less digits than its factorization.

1256938825 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 139321 (or 139297 counting only the distinct ones).

The product of its digits is 1036800, while the sum is 49.

The square root of 1256938825 is about 35453.3330591074. Note that the first 3 decimals coincide. The cubic root of 1256938825 is about 1079.2069008684.

The spelling of 1256938825 in words is "one billion, two hundred fifty-six million, nine hundred thirty-eight thousand, eight hundred twenty-five".