1257241113 has 12 divisors (see below), whose sum is σ = 1840892820. Its totient is φ = 826678656.

The previous prime is 1257241109. The next prime is 1257241121. The reversal of 1257241113 is 3111427521.

It can be written as a sum of positive squares in 2 ways, for example, as 921911769 + 335329344 = 30363^2 + 18312^2 .

It is not a de Polignac number, because 1257241113 - 2² = 1257241109 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1257241123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 956148 + ... + 957461.

It is an arithmetic number, because the mean of its divisors is an integer number (153407735).

Almost surely, 2^1257241113 is an apocalyptic number.

It is an amenable number.

1257241113 is a deficient number, since it is larger than the sum of its proper divisors (583651707).

1257241113 is a wasteful number, since it uses less digits than its factorization.

1257241113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1913688 (or 1913685 counting only the distinct ones).

The product of its digits is 1680, while the sum is 27.

The square root of 1257241113 is about 35457.5959844996. The cubic root of 1257241113 is about 1079.2934086974.

Adding to 1257241113 its reverse (3111427521), we get a palindrome (4368668634).

The spelling of 1257241113 in words is "one billion, two hundred fifty-seven million, two hundred forty-one thousand, one hundred thirteen".