1272269491 has 2 divisors, whose sum is σ = 1272269492. Its totient is φ = 1272269490.

The previous prime is 1272269459. The next prime is 1272269533. The reversal of 1272269491 is 1949622721.

It is a weak prime.

It is an emirp because it is prime and its reverse (1949622721) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1272269491 - 2⁵ = 1272269459 is a prime.

It is not a weakly prime, because it can be changed into another prime (1272269441) 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, 636134745 + 636134746.

It is an arithmetic number, because the mean of its divisors is an integer number (636134746).

Almost surely, 2^1272269491 is an apocalyptic number.

1272269491 is a deficient number, since it is larger than the sum of its proper divisors (1).

1272269491 is an equidigital number, since it uses as much as digits as its factorization.

1272269491 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 108864, while the sum is 43.

The square root of 1272269491 is about 35668.8868763801. The cubic root of 1272269491 is about 1083.5768158260.

The spelling of 1272269491 in words is "one billion, two hundred seventy-two million, two hundred sixty-nine thousand, four hundred ninety-one".