1255981513 has 2 divisors, whose sum is σ = 1255981514. Its totient is φ = 1255981512.

The previous prime is 1255981501. The next prime is 1255981541. The reversal of 1255981513 is 3151895521.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 813846784 + 442134729 = 28528^2 + 21027^2 .

It is an emirp because it is prime and its reverse (3151895521) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1255981513 - 2²¹ = 1253884361 is a prime.

It is not a weakly prime, because it can be changed into another prime (1255981543) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 627990756 + 627990757.

It is an arithmetic number, because the mean of its divisors is an integer number (627990757).

Almost surely, 2^1255981513 is an apocalyptic number.

It is an amenable number.

1255981513 is a deficient number, since it is larger than the sum of its proper divisors (1).

1255981513 is an equidigital number, since it uses as much as digits as its factorization.

1255981513 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 54000, while the sum is 40.

The square root of 1255981513 is about 35439.8294719374. The cubic root of 1255981513 is about 1078.9328487841.

The spelling of 1255981513 in words is "one billion, two hundred fifty-five million, nine hundred eighty-one thousand, five hundred thirteen".