1257361117 has 4 divisors (see below), whose sum is σ = 1271488860. Its totient is φ = 1243233376.

The previous prime is 1257361111. The next prime is 1257361129. The reversal of 1257361117 is 7111637521.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7111637521 = 14747 ⋅482243.

It can be written as a sum of positive squares in 2 ways, for example, as 628053721 + 629307396 = 25061^2 + 25086^2 .

It is a cyclic number.

It is not a de Polignac number, because 1257361117 - 2⁷ = 1257360989 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1257361111) 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 3 ways as a sum of consecutive naturals, for example, 7063738 + ... + 7063915.

It is an arithmetic number, because the mean of its divisors is an integer number (317872215).

Almost surely, 2^1257361117 is an apocalyptic number.

It is an amenable number.

1257361117 is a deficient number, since it is larger than the sum of its proper divisors (14127743).

1257361117 is an equidigital number, since it uses as much as digits as its factorization.

1257361117 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14127742.

The product of its digits is 8820, while the sum is 34.

The square root of 1257361117 is about 35459.2881626239. The cubic root of 1257361117 is about 1079.3277472196.

Adding to 1257361117 its reverse (7111637521), we get a palindrome (8368998638).

The spelling of 1257361117 in words is "one billion, two hundred fifty-seven million, three hundred sixty-one thousand, one hundred seventeen".