1256142325 has 12 divisors (see below), whose sum is σ = 1649241540. Its totient is φ = 945800960.

The previous prime is 1256142323. The next prime is 1256142389. The reversal of 1256142325 is 5232416521.

It can be written as a sum of positive squares in 6 ways, for example, as 59120721 + 1197021604 = 7689^2 + 34598^2 .

It is not a de Polignac number, because 1256142325 - 2¹ = 1256142323 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1256142323) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1477390 + ... + 1478239.

It is an arithmetic number, because the mean of its divisors is an integer number (137436795).

Almost surely, 2^1256142325 is an apocalyptic number.

It is an amenable number.

1256142325 is a deficient number, since it is larger than the sum of its proper divisors (393099215).

1256142325 is a wasteful number, since it uses less digits than its factorization.

1256142325 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2955656 (or 2955651 counting only the distinct ones).

The product of its digits is 14400, while the sum is 31.

The square root of 1256142325 is about 35442.0982025613. The cubic root of 1256142325 is about 1078.9788945640.

Adding to 1256142325 its reverse (5232416521), we get a palindrome (6488558846).

The spelling of 1256142325 in words is "one billion, two hundred fifty-six million, one hundred forty-two thousand, three hundred twenty-five".