1251163189 has 2 divisors, whose sum is σ = 1251163190. Its totient is φ = 1251163188.

The previous prime is 1251163163. The next prime is 1251163213. The reversal of 1251163189 is 9813611521.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1223810289 + 27352900 = 34983^2 + 5230^2 .

It is a cyclic number.

It is not a de Polignac number, because 1251163189 - 2⁹ = 1251162677 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1251163489) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 625581594 + 625581595.

It is an arithmetic number, because the mean of its divisors is an integer number (625581595).

Almost surely, 2^1251163189 is an apocalyptic number.

It is an amenable number.

1251163189 is a deficient number, since it is larger than the sum of its proper divisors (1).

1251163189 is an equidigital number, since it uses as much as digits as its factorization.

1251163189 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12960, while the sum is 37.

The square root of 1251163189 is about 35371.7852108146. The cubic root of 1251163189 is about 1077.5513767238.

The spelling of 1251163189 in words is "one billion, two hundred fifty-one million, one hundred sixty-three thousand, one hundred eighty-nine".