1255989525121 has 4 divisors (see below), whose sum is σ = 1255994304772. Its totient is φ = 1255984745472.

The previous prime is 1255989525079. The next prime is 1255989525151. The reversal of 1255989525121 is 1215259895521.

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 1252474339600 + 3515185521 = 1119140^2 + 59289^2 .

It is a cyclic number.

It is not a de Polignac number, because 1255989525121 - 2¹⁵ = 1255989492353 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1255989525151) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1971216 + ... + 2529361.

It is an arithmetic number, because the mean of its divisors is an integer number (313998576193).

Almost surely, 2^{1255989525121} is an apocalyptic number.

It is an amenable number.

1255989525121 is a deficient number, since it is larger than the sum of its proper divisors (4779651).

1255989525121 is an equidigital number, since it uses as much as digits as its factorization.

1255989525121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4779650.

The product of its digits is 3240000, while the sum is 55.

The spelling of 1255989525121 in words is "one trillion, two hundred fifty-five billion, nine hundred eighty-nine million, five hundred twenty-five thousand, one hundred twenty-one".