1251025625 has 10 divisors (see below), whose sum is σ = 1563282402. Its totient is φ = 1000820000.

The previous prime is 1251025619. The next prime is 1251025651. The reversal of 1251025625 is 5265201521.

It can be written as a sum of positive squares in 5 ways, for example, as 448550041 + 802475584 = 21179^2 + 28328^2 .

It is not a de Polignac number, because 1251025625 - 2²⁴ = 1234248409 is a prime.

It is a super-2 number, since 2×1251025625² = 3130130228813281250, which contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 1000196 + ... + 1001445.

Almost surely, 2^1251025625 is an apocalyptic number.

It is an amenable number.

1251025625 is a deficient number, since it is larger than the sum of its proper divisors (312256777).

1251025625 is an frugal number, since it uses more digits than its factorization.

1251025625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2001661 (or 2001646 counting only the distinct ones).

The product of its (nonzero) digits is 6000, while the sum is 29.

The square root of 1251025625 is about 35369.8406131552. The cubic root of 1251025625 is about 1077.5118834182.

The spelling of 1251025625 in words is "one billion, two hundred fifty-one million, twenty-five thousand, six hundred twenty-five".