1251341131121 has 4 divisors (see below), whose sum is σ = 1252372740852. Its totient is φ = 1250309521392.

The previous prime is 1251341131099. The next prime is 1251341131141. The reversal of 1251341131121 is 1211311431521.

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 243676500496 + 1007664630625 = 493636^2 + 1003825^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1251341131121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1251341131141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 515803046 + ... + 515805471.

It is an arithmetic number, because the mean of its divisors is an integer number (313093185213).

Almost surely, 2^{1251341131121} is an apocalyptic number.

It is an amenable number.

1251341131121 is a deficient number, since it is larger than the sum of its proper divisors (1031609731).

1251341131121 is a wasteful number, since it uses less digits than its factorization.

1251341131121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1031609730.

The product of its digits is 720, while the sum is 26.

Adding to 1251341131121 its reverse (1211311431521), we get a palindrome (2462652562642).

The spelling of 1251341131121 in words is "one trillion, two hundred fifty-one billion, three hundred forty-one million, one hundred thirty-one thousand, one hundred twenty-one".