1250513305 has 4 divisors (see below), whose sum is σ = 1500615972. Its totient is φ = 1000410640.

The previous prime is 1250513269. The next prime is 1250513311. The reversal of 1250513305 is 5033150521.

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 796311961 + 454201344 = 28219^2 + 21312^2 .

It is not a de Polignac number, because 1250513305 - 2¹⁷ = 1250382233 is a prime.

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 1250513305.

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, 125051326 + ... + 125051335.

It is an arithmetic number, because the mean of its divisors is an integer number (375153993).

Almost surely, 2^1250513305 is an apocalyptic number.

It is an amenable number.

1250513305 is a deficient number, since it is larger than the sum of its proper divisors (250102667).

1250513305 is an equidigital number, since it uses as much as digits as its factorization.

1250513305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 250102666.

The product of its (nonzero) digits is 2250, while the sum is 25.

The square root of 1250513305 is about 35362.5975431670. The cubic root of 1250513305 is about 1077.3647757837.

Adding to 1250513305 its reverse (5033150521), we get a palindrome (6283663826).

The spelling of 1250513305 in words is "one billion, two hundred fifty million, five hundred thirteen thousand, three hundred five".