1272183989 has 2 divisors, whose sum is σ = 1272183990. Its totient is φ = 1272183988.

The previous prime is 1272183971. The next prime is 1272184037. The reversal of 1272183989 is 9893812721.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1034715889 + 237468100 = 32167^2 + 15410^2 .

It is a cyclic number.

It is not a de Polignac number, because 1272183989 - 2²⁰ = 1271135413 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1272183929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 636091994 + 636091995.

It is an arithmetic number, because the mean of its divisors is an integer number (636091995).

Almost surely, 2^1272183989 is an apocalyptic number.

It is an amenable number.

1272183989 is a deficient number, since it is larger than the sum of its proper divisors (1).

1272183989 is an equidigital number, since it uses as much as digits as its factorization.

1272183989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 435456, while the sum is 50.

The square root of 1272183989 is about 35667.6883046827. The cubic root of 1272183989 is about 1083.5525416029.

The spelling of 1272183989 in words is "one billion, two hundred seventy-two million, one hundred eighty-three thousand, nine hundred eighty-nine".