1257013679 has 2 divisors, whose sum is σ = 1257013680. Its totient is φ = 1257013678.

The previous prime is 1257013663. The next prime is 1257013727. The reversal of 1257013679 is 9763107521.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1257013679 - 2⁴ = 1257013663 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1257010679) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 628506839 + 628506840.

It is an arithmetic number, because the mean of its divisors is an integer number (628506840).

Almost surely, 2^1257013679 is an apocalyptic number.

1257013679 is a deficient number, since it is larger than the sum of its proper divisors (1).

1257013679 is an equidigital number, since it uses as much as digits as its factorization.

1257013679 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 79380, while the sum is 41.

The square root of 1257013679 is about 35454.3887128237. The cubic root of 1257013679 is about 1079.2283236426.

The spelling of 1257013679 in words is "one billion, two hundred fifty-seven million, thirteen thousand, six hundred seventy-nine".