1251000125 has 16 divisors (see below), whose sum is σ = 1566622512. Its totient is φ = 997355200.

The previous prime is 1251000103. The next prime is 1251000169. The reversal of 1251000125 is 5210001521.

It can be written as a sum of positive squares in 8 ways, for example, as 44063044 + 1206937081 = 6638^2 + 34741^2 .

It is not a de Polignac number, because 1251000125 - 2¹² = 1250996029 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 19547 + ... + 53703.

It is an arithmetic number, because the mean of its divisors is an integer number (97913907).

Almost surely, 2^1251000125 is an apocalyptic number.

It is an amenable number.

1251000125 is a deficient number, since it is larger than the sum of its proper divisors (315622387).

1251000125 is an equidigital number, since it uses as much as digits as its factorization.

1251000125 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34465 (or 34455 counting only the distinct ones).

The product of its (nonzero) digits is 100, while the sum is 17.

The square root of 1251000125 is about 35369.4801347150. The cubic root of 1251000125 is about 1077.5045622946.

Adding to 1251000125 its reverse (5210001521), we get a palindrome (6461001646).

The spelling of 1251000125 in words is "one billion, two hundred fifty-one million, one hundred twenty-five", and thus it is an aban number.