1256261183 has 2 divisors, whose sum is σ = 1256261184. Its totient is φ = 1256261182.

The previous prime is 1256261131. The next prime is 1256261231. The reversal of 1256261183 is 3811626521.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1256261183 - 2¹⁸ = 1255999039 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1256261113) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 628130591 + 628130592.

It is an arithmetic number, because the mean of its divisors is an integer number (628130592).

Almost surely, 2^1256261183 is an apocalyptic number.

1256261183 is a deficient number, since it is larger than the sum of its proper divisors (1).

1256261183 is an equidigital number, since it uses as much as digits as its factorization.

1256261183 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 17280, while the sum is 35.

The square root of 1256261183 is about 35443.7749541439. The cubic root of 1256261183 is about 1079.0129250041.

The spelling of 1256261183 in words is "one billion, two hundred fifty-six million, two hundred sixty-one thousand, one hundred eighty-three".