1252631305 has 4 divisors (see below), whose sum is σ = 1503157572. Its totient is φ = 1002105040.

The previous prime is 1252631293. The next prime is 1252631339. The reversal of 1252631305 is 5031362521.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 847333881 + 405297424 = 29109^2 + 20132^2 .

It is not a de Polignac number, because 1252631305 - 2⁵ = 1252631273 is a prime.

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 3 ways as a sum of consecutive naturals, for example, 125263126 + ... + 125263135.

It is an arithmetic number, because the mean of its divisors is an integer number (375789393).

Almost surely, 2^1252631305 is an apocalyptic number.

It is an amenable number.

1252631305 is a deficient number, since it is larger than the sum of its proper divisors (250526267).

1252631305 is an equidigital number, since it uses as much as digits as its factorization.

1252631305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 250526266.

The product of its (nonzero) digits is 5400, while the sum is 28.

The square root of 1252631305 is about 35392.5317687221. The cubic root of 1252631305 is about 1077.9726785631.

Adding to 1252631305 its reverse (5031362521), we get a palindrome (6283993826).

The spelling of 1252631305 in words is "one billion, two hundred fifty-two million, six hundred thirty-one thousand, three hundred five".