1257310994 has 4 divisors (see below), whose sum is σ = 1885966494. Its totient is φ = 628655496.

The previous prime is 1257310987. The next prime is 1257311059. The reversal of 1257310994 is 4990137521.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 4990137521 = 167 ⋅29881063.

It can be written as a sum of positive squares in only one way, i.e., 796650625 + 460660369 = 28225^2 + 21463^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 314327747 + ... + 314327750.

Almost surely, 2^1257310994 is an apocalyptic number.

1257310994 is a deficient number, since it is larger than the sum of its proper divisors (628655500).

1257310994 is an equidigital number, since it uses as much as digits as its factorization.

1257310994 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 628655499.

The product of its (nonzero) digits is 68040, while the sum is 41.

The square root of 1257310994 is about 35458.5813873031. The cubic root of 1257310994 is about 1079.3134050488.

The spelling of 1257310994 in words is "one billion, two hundred fifty-seven million, three hundred ten thousand, nine hundred ninety-four".