1251543121325 has 48 divisors (see below), whose sum is σ = 1782021943296. Its totient is φ = 854138520000.

The previous prime is 1251543121249. The next prime is 1251543121349. The reversal of 1251543121325 is 5231213451521.

It is not a de Polignac number, because 1251543121325 - 2²⁰ = 1251542072749 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 62495264 + ... + 62515286.

It is an arithmetic number, because the mean of its divisors is an integer number (37125457152).

Almost surely, 2^{1251543121325} is an apocalyptic number.

It is an amenable number.

1251543121325 is a deficient number, since it is larger than the sum of its proper divisors (530478821971).

1251543121325 is a wasteful number, since it uses less digits than its factorization.

1251543121325 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21714 (or 21709 counting only the distinct ones).

The product of its digits is 36000, while the sum is 35.

Adding to 1251543121325 its reverse (5231213451521), we get a palindrome (6482756572846).

The spelling of 1251543121325 in words is "one trillion, two hundred fifty-one billion, five hundred forty-three million, one hundred twenty-one thousand, three hundred twenty-five".