1257341513 has 4 divisors (see below), whose sum is σ = 1257457428. Its totient is φ = 1257225600.

The previous prime is 1257341489. The next prime is 1257341521. The reversal of 1257341513 is 3151437521.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 518154169 + 739187344 = 22763^2 + 27188^2 .

It is a cyclic number.

It is not a de Polignac number, because 1257341513 - 2¹⁴ = 1257325129 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1257341513.

It is not an unprimeable number, because it can be changed into a prime (1257341563) by changing a digit.

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 in 3 ways as a sum of consecutive naturals, for example, 39788 + ... + 64013.

It is an arithmetic number, because the mean of its divisors is an integer number (314364357).

Almost surely, 2^1257341513 is an apocalyptic number.

It is an amenable number.

1257341513 is a deficient number, since it is larger than the sum of its proper divisors (115915).

1257341513 is a wasteful number, since it uses less digits than its factorization.

1257341513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 115914.

The product of its digits is 12600, while the sum is 32.

The square root of 1257341513 is about 35459.0117318574. The cubic root of 1257341513 is about 1079.3221377860.

The spelling of 1257341513 in words is "one billion, two hundred fifty-seven million, three hundred forty-one thousand, five hundred thirteen".