1256256247 has 2 divisors, whose sum is σ = 1256256248. Its totient is φ = 1256256246.

The previous prime is 1256256241. The next prime is 1256256257. The reversal of 1256256247 is 7426526521.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1256256247 - 2⁷ = 1256256119 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1256256241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 628128123 + 628128124.

It is an arithmetic number, because the mean of its divisors is an integer number (628128124).

Almost surely, 2^1256256247 is an apocalyptic number.

1256256247 is a deficient number, since it is larger than the sum of its proper divisors (1).

1256256247 is an equidigital number, since it uses as much as digits as its factorization.

1256256247 is an evil number, because the sum of its binary digits is even.

The product of its digits is 201600, while the sum is 40.

The square root of 1256256247 is about 35443.7053226663. The cubic root of 1256256247 is about 1079.0115118121.

The spelling of 1256256247 in words is "one billion, two hundred fifty-six million, two hundred fifty-six thousand, two hundred forty-seven".