1375131257 has 4 divisors (see below), whose sum is σ = 1390582260. Its totient is φ = 1359680256.

The previous prime is 1375131229. The next prime is 1375131259. The reversal of 1375131257 is 7521315731.

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 933669136 + 441462121 = 30556^2 + 21011^2 .

It is a cyclic number.

It is not a de Polignac number, because 1375131257 - 2²² = 1370936953 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1375131259) 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, 7725368 + ... + 7725545.

It is an arithmetic number, because the mean of its divisors is an integer number (347645565).

Almost surely, 2^1375131257 is an apocalyptic number.

It is an amenable number.

1375131257 is a deficient number, since it is larger than the sum of its proper divisors (15451003).

1375131257 is an equidigital number, since it uses as much as digits as its factorization.

1375131257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15451002.

The product of its digits is 22050, while the sum is 35.

The square root of 1375131257 is about 37082.7622622695. The cubic root of 1375131257 is about 1112.0254275473.

Adding to 1375131257 its reverse (7521315731), we get a palindrome (8896446988).

The spelling of 1375131257 in words is "one billion, three hundred seventy-five million, one hundred thirty-one thousand, two hundred fifty-seven".