1251363825 has 36 divisors (see below), whose sum is σ = 2313645568. Its totient is φ = 645861600.

The previous prime is 1251363809. The next prime is 1251363857. The reversal of 1251363825 is 5283631521.

1251363825 is a `hidden beast` number, since 1 + 2 + 5 + 13 + 638 + 2 + 5 = 666.

It is not a de Polignac number, because 1251363825 - 2⁴ = 1251363809 is a prime.

It is a super-2 number, since 2×1251363825² = 3131822845037261250, which contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1251363825.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 82729 + ... + 96678.

Almost surely, 2^1251363825 is an apocalyptic number.

1251363825 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1251363825 is a deficient number, since it is larger than the sum of its proper divisors (1062281743).

1251363825 is a wasteful number, since it uses less digits than its factorization.

1251363825 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 179454 (or 179446 counting only the distinct ones).

The product of its digits is 43200, while the sum is 36.

The square root of 1251363825 is about 35374.6211993853. The cubic root of 1251363825 is about 1077.6089722064.

The spelling of 1251363825 in words is "one billion, two hundred fifty-one million, three hundred sixty-three thousand, eight hundred twenty-five".