1273792391 has 2 divisors, whose sum is σ = 1273792392. Its totient is φ = 1273792390.

The previous prime is 1273792321. The next prime is 1273792393. The reversal of 1273792391 is 1932973721.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1273792391 is a prime.

It is a Sophie Germain prime.

Together with 1273792393, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1273792393) 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, 636896195 + 636896196.

It is an arithmetic number, because the mean of its divisors is an integer number (636896196).

Almost surely, 2^1273792391 is an apocalyptic number.

1273792391 is a deficient number, since it is larger than the sum of its proper divisors (1).

1273792391 is an equidigital number, since it uses as much as digits as its factorization.

1273792391 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 142884, while the sum is 44.

The square root of 1273792391 is about 35690.2282284661. The cubic root of 1273792391 is about 1084.0089887169.

The spelling of 1273792391 in words is "one billion, two hundred seventy-three million, seven hundred ninety-two thousand, three hundred ninety-one".