1272782101 has 2 divisors, whose sum is σ = 1272782102. Its totient is φ = 1272782100.

The previous prime is 1272782099. The next prime is 1272782143. The reversal of 1272782101 is 1012872721.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1271279025 + 1503076 = 35655^2 + 1226^2 .

It is a cyclic number.

It is not a de Polignac number, because 1272782101 - 2¹ = 1272782099 is a prime.

Together with 1272782099, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1272782501) 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, 636391050 + 636391051.

It is an arithmetic number, because the mean of its divisors is an integer number (636391051).

Almost surely, 2^1272782101 is an apocalyptic number.

It is an amenable number.

1272782101 is a deficient number, since it is larger than the sum of its proper divisors (1).

1272782101 is an equidigital number, since it uses as much as digits as its factorization.

1272782101 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3136, while the sum is 31.

The square root of 1272782101 is about 35676.0718269262. The cubic root of 1272782101 is about 1083.7223242353.

The spelling of 1272782101 in words is "one billion, two hundred seventy-two million, seven hundred eighty-two thousand, one hundred one".