1272392909 has 2 divisors, whose sum is σ = 1272392910. Its totient is φ = 1272392908.

The previous prime is 1272392857. The next prime is 1272392921. The reversal of 1272392909 is 9092932721.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1245384100 + 27008809 = 35290^2 + 5197^2 .

It is an emirp because it is prime and its reverse (9092932721) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1272392909 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1272392909.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1272392939) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 636196454 + 636196455.

It is an arithmetic number, because the mean of its divisors is an integer number (636196455).

Almost surely, 2^1272392909 is an apocalyptic number.

It is an amenable number.

1272392909 is a deficient number, since it is larger than the sum of its proper divisors (1).

1272392909 is an equidigital number, since it uses as much as digits as its factorization.

1272392909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 122472, while the sum is 44.

The square root of 1272392909 is about 35670.6168856105. The cubic root of 1272392909 is about 1083.6118525748.

The spelling of 1272392909 in words is "one billion, two hundred seventy-two million, three hundred ninety-two thousand, nine hundred nine".