1250131665121 has 4 divisors (see below), whose sum is σ = 1254075298452. Its totient is φ = 1246188031792.

The previous prime is 1250131665109. The next prime is 1250131665163. The reversal of 1250131665121 is 1215661310521.

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 745088344225 + 505043320896 = 863185^2 + 710664^2 .

It is a cyclic number.

It is not a de Polignac number, because 1250131665121 - 2¹¹ = 1250131663073 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1250131665221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1971816190 + ... + 1971816823.

It is an arithmetic number, because the mean of its divisors is an integer number (313518824613).

Almost surely, 2^{1250131665121} is an apocalyptic number.

It is an amenable number.

1250131665121 is a deficient number, since it is larger than the sum of its proper divisors (3943633331).

1250131665121 is an equidigital number, since it uses as much as digits as its factorization.

1250131665121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3943633330.

The product of its (nonzero) digits is 10800, while the sum is 34.

Adding to 1250131665121 its reverse (1215661310521), we get a palindrome (2465792975642).

The spelling of 1250131665121 in words is "one trillion, two hundred fifty billion, one hundred thirty-one million, six hundred sixty-five thousand, one hundred twenty-one".