1278255607 has 2 divisors, whose sum is σ = 1278255608. Its totient is φ = 1278255606.

The previous prime is 1278255599. The next prime is 1278255637. The reversal of 1278255607 is 7065528721.

It is a weak prime.

It is an emirp because it is prime and its reverse (7065528721) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1278255607 - 2³ = 1278255599 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1278255637) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 639127803 + 639127804.

It is an arithmetic number, because the mean of its divisors is an integer number (639127804).

Almost surely, 2^1278255607 is an apocalyptic number.

1278255607 is a deficient number, since it is larger than the sum of its proper divisors (1).

1278255607 is an equidigital number, since it uses as much as digits as its factorization.

1278255607 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 235200, while the sum is 43.

The square root of 1278255607 is about 35752.7006951922. The cubic root of 1278255607 is about 1085.2735920871.

The spelling of 1278255607 in words is "one billion, two hundred seventy-eight million, two hundred fifty-five thousand, six hundred seven".