1255636243 has 2 divisors, whose sum is σ = 1255636244. Its totient is φ = 1255636242.

The previous prime is 1255636237. The next prime is 1255636279. The reversal of 1255636243 is 3426365521.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1255636243 is a prime.

It is not a weakly prime, because it can be changed into another prime (1255636843) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 627818121 + 627818122.

It is an arithmetic number, because the mean of its divisors is an integer number (627818122).

Almost surely, 2^1255636243 is an apocalyptic number.

1255636243 is a deficient number, since it is larger than the sum of its proper divisors (1).

1255636243 is an equidigital number, since it uses as much as digits as its factorization.

1255636243 is an evil number, because the sum of its binary digits is even.

The product of its digits is 129600, while the sum is 37.

The square root of 1255636243 is about 35434.9579229325. The cubic root of 1255636243 is about 1078.8339733146.

The spelling of 1255636243 in words is "one billion, two hundred fifty-five million, six hundred thirty-six thousand, two hundred forty-three".