1273157989 has 2 divisors, whose sum is σ = 1273157990. Its totient is φ = 1273157988.

The previous prime is 1273157983. The next prime is 1273158017. The reversal of 1273157989 is 9897513721.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 939912964 + 333245025 = 30658^2 + 18255^2 .

It is a cyclic number.

It is not a de Polignac number, because 1273157989 - 2³ = 1273157981 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1273157981) 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 as a sum of consecutive naturals, namely, 636578994 + 636578995.

It is an arithmetic number, because the mean of its divisors is an integer number (636578995).

Almost surely, 2^1273157989 is an apocalyptic number.

It is an amenable number.

1273157989 is a deficient number, since it is larger than the sum of its proper divisors (1).

1273157989 is an equidigital number, since it uses as much as digits as its factorization.

1273157989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 952560, while the sum is 52.

The square root of 1273157989 is about 35681.3395068066. The cubic root of 1273157989 is about 1083.8289981956.

The spelling of 1273157989 in words is "one billion, two hundred seventy-three million, one hundred fifty-seven thousand, nine hundred eighty-nine".