1251163273 has 2 divisors, whose sum is σ = 1251163274. Its totient is φ = 1251163272.

The previous prime is 1251163267. The next prime is 1251163307. The reversal of 1251163273 is 3723611521.

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., 687907984 + 563255289 = 26228^2 + 23733^2 .

It is a cyclic number.

It is not a de Polignac number, because 1251163273 - 2⁵ = 1251163241 is a prime.

It is not a weakly prime, because it can be changed into another prime (1251163213) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 625581636 + 625581637.

It is an arithmetic number, because the mean of its divisors is an integer number (625581637).

Almost surely, 2^1251163273 is an apocalyptic number.

It is an amenable number.

1251163273 is a deficient number, since it is larger than the sum of its proper divisors (1).

1251163273 is an equidigital number, since it uses as much as digits as its factorization.

1251163273 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7560, while the sum is 31.

The square root of 1251163273 is about 35371.7863982016. The cubic root of 1251163273 is about 1077.5514008386.

Adding to 1251163273 its reverse (3723611521), we get a palindrome (4974774794).

The spelling of 1251163273 in words is "one billion, two hundred fifty-one million, one hundred sixty-three thousand, two hundred seventy-three".