1272040817 has 2 divisors, whose sum is σ = 1272040818. Its totient is φ = 1272040816.

The previous prime is 1272040813. The next prime is 1272040849. The reversal of 1272040817 is 7180402721.

It is a happy number.

It is an a-pointer prime, because the next prime (1272040849) can be obtained adding 1272040817 to its sum of digits (32).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1188939361 + 83101456 = 34481^2 + 9116^2 .

It is a cyclic number.

It is not a de Polignac number, because 1272040817 - 2² = 1272040813 is a prime.

It is a super-2 number, since 2×1272040817² = 3236175680228054978, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1272040811) 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, 636020408 + 636020409.

It is an arithmetic number, because the mean of its divisors is an integer number (636020409).

Almost surely, 2^1272040817 is an apocalyptic number.

It is an amenable number.

1272040817 is a deficient number, since it is larger than the sum of its proper divisors (1).

1272040817 is an equidigital number, since it uses as much as digits as its factorization.

1272040817 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6272, while the sum is 32.

The square root of 1272040817 is about 35665.6812215889. The cubic root of 1272040817 is about 1083.5118922928.

The spelling of 1272040817 in words is "one billion, two hundred seventy-two million, forty thousand, eight hundred seventeen".