1256252361 has 32 divisors (see below), whose sum is σ = 2095365888. Its totient is φ = 651767040.

The previous prime is 1256252357. The next prime is 1256252381. The reversal of 1256252361 is 1632526521.

It is not a de Polignac number, because 1256252361 - 2² = 1256252357 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1256252311) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 21066 + ... + 54371.

It is an arithmetic number, because the mean of its divisors is an integer number (65480184).

Almost surely, 2^1256252361 is an apocalyptic number.

It is an amenable number.

1256252361 is a deficient number, since it is larger than the sum of its proper divisors (839113527).

1256252361 is a wasteful number, since it uses less digits than its factorization.

1256252361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75521.

The product of its digits is 21600, while the sum is 33.

The square root of 1256252361 is about 35443.6505032989. The cubic root of 1256252361 is about 1079.0103992358.

Adding to 1256252361 its reverse (1632526521), we get a palindrome (2888778882).

The spelling of 1256252361 in words is "one billion, two hundred fifty-six million, two hundred fifty-two thousand, three hundred sixty-one".