1251520312125 has 32 divisors (see below), whose sum is σ = 2088709623936. Its totient is φ = 665496787200.

The previous prime is 1251520312069. The next prime is 1251520312127. The reversal of 1251520312125 is 5212130251521.

It is not a de Polignac number, because 1251520312125 - 2¹² = 1251520308029 is a prime.

It is a super-2 number, since 2×1251520312125² (a number of 25 digits) contains 22 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1251520312092 and 1251520312101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1251520312127) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4825239 + ... + 5077988.

It is an arithmetic number, because the mean of its divisors is an integer number (65272175748).

Almost surely, 2^{1251520312125} is an apocalyptic number.

1251520312125 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1251520312125 is a deficient number, since it is larger than the sum of its proper divisors (837189311811).

1251520312125 is an equidigital number, since it uses as much as digits as its factorization.

1251520312125 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9903582 (or 9903572 counting only the distinct ones).

The product of its (nonzero) digits is 6000, while the sum is 30.

Adding to 1251520312125 its reverse (5212130251521), we get a palindrome (6463650563646).

The spelling of 1251520312125 in words is "one trillion, two hundred fifty-one billion, five hundred twenty million, three hundred twelve thousand, one hundred twenty-five".