1255678243 has 2 divisors, whose sum is σ = 1255678244. Its totient is φ = 1255678242.

The previous prime is 1255678211. The next prime is 1255678267. The reversal of 1255678243 is 3428765521.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1255678243 - 2⁵ = 1255678211 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1255678243.

It is not a weakly prime, because it can be changed into another prime (1255678283) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 627839121 + 627839122.

It is an arithmetic number, because the mean of its divisors is an integer number (627839122).

Almost surely, 2^1255678243 is an apocalyptic number.

1255678243 is a deficient number, since it is larger than the sum of its proper divisors (1).

1255678243 is an equidigital number, since it uses as much as digits as its factorization.

1255678243 is an evil number, because the sum of its binary digits is even.

The product of its digits is 403200, while the sum is 43.

The square root of 1255678243 is about 35435.5505530816. The cubic root of 1255678243 is about 1078.8460018836.

The spelling of 1255678243 in words is "one billion, two hundred fifty-five million, six hundred seventy-eight thousand, two hundred forty-three".