1256298391247 has 2 divisors, whose sum is σ = 1256298391248. Its totient is φ = 1256298391246.

The previous prime is 1256298391213. The next prime is 1256298391331. The reversal of 1256298391247 is 7421938926521.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1256298391247 - 2²² = 1256294196943 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1256298391207) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 628149195623 + 628149195624.

It is an arithmetic number, because the mean of its divisors is an integer number (628149195624).

Almost surely, 2^{1256298391247} is an apocalyptic number.

1256298391247 is a deficient number, since it is larger than the sum of its proper divisors (1).

1256298391247 is an equidigital number, since it uses as much as digits as its factorization.

1256298391247 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 13063680, while the sum is 59.

The spelling of 1256298391247 in words is "one trillion, two hundred fifty-six billion, two hundred ninety-eight million, three hundred ninety-one thousand, two hundred forty-seven".