1272672361 has 2 divisors, whose sum is σ = 1272672362. Its totient is φ = 1272672360.

The previous prime is 1272672347. The next prime is 1272672389. The reversal of 1272672361 is 1632762721.

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., 1249198336 + 23474025 = 35344^2 + 4845^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1272672361 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1272672361.

It is not a weakly prime, because it can be changed into another prime (1272672391) 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, 636336180 + 636336181.

It is an arithmetic number, because the mean of its divisors is an integer number (636336181).

Almost surely, 2^1272672361 is an apocalyptic number.

It is an amenable number.

1272672361 is a deficient number, since it is larger than the sum of its proper divisors (1).

1272672361 is an equidigital number, since it uses as much as digits as its factorization.

1272672361 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 42336, while the sum is 37.

The square root of 1272672361 is about 35674.5337881240. The cubic root of 1272672361 is about 1083.6911769541.

The spelling of 1272672361 in words is "one billion, two hundred seventy-two million, six hundred seventy-two thousand, three hundred sixty-one".