1251440105125 has 16 divisors (see below), whose sum is σ = 1784911145472. Its totient is φ = 858130357200.

The previous prime is 1251440105077. The next prime is 1251440105141. The reversal of 1251440105125 is 5215010441521.

It is not a de Polignac number, because 1251440105125 - 2¹⁹ = 1251439580837 is a prime.

It is a super-2 number, since 2×1251440105125² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 715107757 + ... + 715109506.

It is an arithmetic number, because the mean of its divisors is an integer number (111556946592).

Almost surely, 2^{1251440105125} is an apocalyptic number.

It is an amenable number.

1251440105125 is a deficient number, since it is larger than the sum of its proper divisors (533471040347).

1251440105125 is an equidigital number, since it uses as much as digits as its factorization.

1251440105125 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1430217285 (or 1430217275 counting only the distinct ones).

The product of its (nonzero) digits is 8000, while the sum is 31.

Adding to 1251440105125 its reverse (5215010441521), we get a palindrome (6466450546646).

The spelling of 1251440105125 in words is "one trillion, two hundred fifty-one billion, four hundred forty million, one hundred five thousand, one hundred twenty-five".