1251242525 has 12 divisors (see below), whose sum is σ = 1670890452. Its totient is φ = 923994240.

The previous prime is 1251242401. The next prime is 1251242533. The reversal of 1251242525 is 5252421521.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 244703449 + 1006539076 = 15643^2 + 31726^2 .

It is not a de Polignac number, because 1251242525 - 2⁸ = 1251242269 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1924664 + ... + 1925313.

It is an arithmetic number, because the mean of its divisors is an integer number (139240871).

Almost surely, 2^1251242525 is an apocalyptic number.

It is an amenable number.

1251242525 is a deficient number, since it is larger than the sum of its proper divisors (419647927).

1251242525 is a wasteful number, since it uses less digits than its factorization.

1251242525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3850000 (or 3849995 counting only the distinct ones).

The product of its digits is 8000, while the sum is 29.

The square root of 1251242525 is about 35372.9066518430. The cubic root of 1251242525 is about 1077.5741520127.

The spelling of 1251242525 in words is "one billion, two hundred fifty-one million, two hundred forty-two thousand, five hundred twenty-five".