1273555247 has 2 divisors, whose sum is σ = 1273555248. Its totient is φ = 1273555246.

The previous prime is 1273555219. The next prime is 1273555249. The reversal of 1273555247 is 7425553721.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1273555247 - 2⁶ = 1273555183 is a prime.

It is a super-3 number, since 3×1273555247³ (a number of 28 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

Together with 1273555249, 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 (1273555249) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 636777623 + 636777624.

It is an arithmetic number, because the mean of its divisors is an integer number (636777624).

Almost surely, 2^1273555247 is an apocalyptic number.

1273555247 is a deficient number, since it is larger than the sum of its proper divisors (1).

1273555247 is an equidigital number, since it uses as much as digits as its factorization.

1273555247 is an evil number, because the sum of its binary digits is even.

The product of its digits is 294000, while the sum is 41.

The square root of 1273555247 is about 35686.9058199222. The cubic root of 1273555247 is about 1083.9417139700.

The spelling of 1273555247 in words is "one billion, two hundred seventy-three million, five hundred fifty-five thousand, two hundred forty-seven".