1273642229 has 2 divisors, whose sum is σ = 1273642230. Its totient is φ = 1273642228.

The previous prime is 1273642189. The next prime is 1273642259. The reversal of 1273642229 is 9222463721.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1127280625 + 146361604 = 33575^2 + 12098^2 .

It is a cyclic number.

It is not a de Polignac number, because 1273642229 - 2²⁴ = 1256865013 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1273642192 and 1273642201.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1273642259) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 636821114 + 636821115.

It is an arithmetic number, because the mean of its divisors is an integer number (636821115).

Almost surely, 2^1273642229 is an apocalyptic number.

It is an amenable number.

1273642229 is a deficient number, since it is larger than the sum of its proper divisors (1).

1273642229 is an equidigital number, since it uses as much as digits as its factorization.

1273642229 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 72576, while the sum is 38.

The square root of 1273642229 is about 35688.1244814014. The cubic root of 1273642229 is about 1083.9663906306.

The spelling of 1273642229 in words is "one billion, two hundred seventy-three million, six hundred forty-two thousand, two hundred twenty-nine".