1252520305 has 8 divisors (see below), whose sum is σ = 1591437672. Its totient is φ = 943074048.

The previous prime is 1252520303. The next prime is 1252520317. The reversal of 1252520305 is 5030252521.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 331822656 + 920697649 = 18216^2 + 30343^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1252520305 - 2¹ = 1252520303 is a prime.

It is a super-2 number, since 2×1252520305² = 3137614228874586050, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1252520305.

It is not an unprimeable number, because it can be changed into a prime (1252520303) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 7367682 + ... + 7367851.

It is an arithmetic number, because the mean of its divisors is an integer number (198929709).

Almost surely, 2^1252520305 is an apocalyptic number.

It is an amenable number.

1252520305 is a deficient number, since it is larger than the sum of its proper divisors (338917367).

1252520305 is a wasteful number, since it uses less digits than its factorization.

1252520305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14735555.

The product of its (nonzero) digits is 3000, while the sum is 25.

The square root of 1252520305 is about 35390.9636065479. The cubic root of 1252520305 is about 1077.9408366579.

Adding to 1252520305 its reverse (5030252521), we get a palindrome (6282772826).

The spelling of 1252520305 in words is "one billion, two hundred fifty-two million, five hundred twenty thousand, three hundred five".