1263509725 has 6 divisors (see below), whose sum is σ = 1566752090. Its totient is φ = 1010807760.

The previous prime is 1263509713. The next prime is 1263509743. The reversal of 1263509725 is 5279053621.

It can be written as a sum of positive squares in 3 ways, for example, as 296735076 + 966774649 = 17226^2 + 31093^2 .

It is not a de Polignac number, because 1263509725 - 2⁹ = 1263509213 is a prime.

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 5 ways as a sum of consecutive naturals, for example, 25270170 + ... + 25270219.

Almost surely, 2^1263509725 is an apocalyptic number.

It is an amenable number.

1263509725 is a deficient number, since it is larger than the sum of its proper divisors (303242365).

1263509725 is an equidigital number, since it uses as much as digits as its factorization.

1263509725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50540399 (or 50540394 counting only the distinct ones).

The product of its (nonzero) digits is 113400, while the sum is 40.

The square root of 1263509725 is about 35545.8819696459. The cubic root of 1263509725 is about 1081.0842235293.

The spelling of 1263509725 in words is "one billion, two hundred sixty-three million, five hundred nine thousand, seven hundred twenty-five".