1256115983 has 2 divisors, whose sum is σ = 1256115984. Its totient is φ = 1256115982.

The previous prime is 1256115977. The next prime is 1256116013. The reversal of 1256115983 is 3895116521.

It is a weak prime.

It is an emirp because it is prime and its reverse (3895116521) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1256115983 - 2¹⁴ = 1256099599 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1256115983.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1256145983) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 628057991 + 628057992.

It is an arithmetic number, because the mean of its divisors is an integer number (628057992).

Almost surely, 2^1256115983 is an apocalyptic number.

1256115983 is a deficient number, since it is larger than the sum of its proper divisors (1).

1256115983 is an equidigital number, since it uses as much as digits as its factorization.

1256115983 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 64800, while the sum is 41.

The square root of 1256115983 is about 35441.7265804024. The cubic root of 1256115983 is about 1078.9713522496.

The spelling of 1256115983 in words is "one billion, two hundred fifty-six million, one hundred fifteen thousand, nine hundred eighty-three".