1251250313 has 2 divisors, whose sum is σ = 1251250314. Its totient is φ = 1251250312.

The previous prime is 1251250307. The next prime is 1251250369. The reversal of 1251250313 is 3130521521.

1251250313 = 25012² + 25013².

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 625650169 + 625600144 = 25013^2 + 25012^2 .

It is a cyclic number.

It is not a de Polignac number, because 1251250313 - 2¹⁶ = 1251184777 is a prime.

It is not a weakly prime, because it can be changed into another prime (1251250213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 625625156 + 625625157.

It is an arithmetic number, because the mean of its divisors is an integer number (625625157).

Almost surely, 2^1251250313 is an apocalyptic number.

1251250313 is the 25013-rd centered square number.

It is an amenable number.

1251250313 is a deficient number, since it is larger than the sum of its proper divisors (1).

1251250313 is an equidigital number, since it uses as much as digits as its factorization.

1251250313 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 900, while the sum is 23.

The square root of 1251250313 is about 35373.0167359246. The cubic root of 1251250313 is about 1077.5763876918.

Adding to 1251250313 its reverse (3130521521), we get a palindrome (4381771834).

The spelling of 1251250313 in words is "one billion, two hundred fifty-one million, two hundred fifty thousand, three hundred thirteen".