1256347601 has 2 divisors, whose sum is σ = 1256347602. Its totient is φ = 1256347600.

The previous prime is 1256347597. The next prime is 1256347613. The reversal of 1256347601 is 1067436521.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 759057601 + 497290000 = 27551^2 + 22300^2 .

It is an emirp because it is prime and its reverse (1067436521) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1256347601 - 2² = 1256347597 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (1256347661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 628173800 + 628173801.

It is an arithmetic number, because the mean of its divisors is an integer number (628173801).

Almost surely, 2^1256347601 is an apocalyptic number.

It is an amenable number.

1256347601 is a deficient number, since it is larger than the sum of its proper divisors (1).

1256347601 is an equidigital number, since it uses as much as digits as its factorization.

1256347601 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 30240, while the sum is 35.

The square root of 1256347601 is about 35444.9940189020. The cubic root of 1256347601 is about 1079.0376661440.

The spelling of 1256347601 in words is "one billion, two hundred fifty-six million, three hundred forty-seven thousand, six hundred one".