1256262613 has 2 divisors, whose sum is σ = 1256262614. Its totient is φ = 1256262612.

The previous prime is 1256262611. The next prime is 1256262703. The reversal of 1256262613 is 3162626521.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1220943364 + 35319249 = 34942^2 + 5943^2 .

It is a cyclic number.

It is not a de Polignac number, because 1256262613 - 2¹ = 1256262611 is a prime.

Together with 1256262611, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1256262611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 628131306 + 628131307.

It is an arithmetic number, because the mean of its divisors is an integer number (628131307).

Almost surely, 2^1256262613 is an apocalyptic number.

It is an amenable number.

1256262613 is a deficient number, since it is larger than the sum of its proper divisors (1).

1256262613 is an equidigital number, since it uses as much as digits as its factorization.

1256262613 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 25920, while the sum is 34.

The square root of 1256262613 is about 35443.7951269330. The cubic root of 1256262613 is about 1079.0133344169.

The spelling of 1256262613 in words is "one billion, two hundred fifty-six million, two hundred sixty-two thousand, six hundred thirteen".