1255555439 has 2 divisors, whose sum is σ = 1255555440. Its totient is φ = 1255555438.

The previous prime is 1255555429. The next prime is 1255555501. The reversal of 1255555439 is 9345555521.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1255555439 - 2¹⁶ = 1255489903 is a prime.

It is a Sophie Germain prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1255555439.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1255555429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 627777719 + 627777720.

It is an arithmetic number, because the mean of its divisors is an integer number (627777720).

Almost surely, 2^1255555439 is an apocalyptic number.

1255555439 is a deficient number, since it is larger than the sum of its proper divisors (1).

1255555439 is an equidigital number, since it uses as much as digits as its factorization.

1255555439 is an evil number, because the sum of its binary digits is even.

The product of its digits is 675000, while the sum is 44.

The square root of 1255555439 is about 35433.8177310885. The cubic root of 1255555439 is about 1078.8108307389.

The spelling of 1255555439 in words is "one billion, two hundred fifty-five million, five hundred fifty-five thousand, four hundred thirty-nine".