1242279869647 has 2 divisors, whose sum is σ = 1242279869648. Its totient is φ = 1242279869646.

The previous prime is 1242279869641. The next prime is 1242279869659. The reversal of 1242279869647 is 7469689722421.

It is a weak prime.

It is an emirp because it is prime and its reverse (7469689722421) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1242279869647 - 2²³ = 1242271481039 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1242279869641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 621139934823 + 621139934824.

It is an arithmetic number, because the mean of its divisors is an integer number (621139934824).

Almost surely, 2^{1242279869647} is an apocalyptic number.

1242279869647 is a deficient number, since it is larger than the sum of its proper divisors (1).

1242279869647 is an equidigital number, since it uses as much as digits as its factorization.

1242279869647 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 146313216, while the sum is 67.

It can be divided in two parts, 1242279869 and 647, that added together give a square (1242280516 = 35246²).

The spelling of 1242279869647 in words is "one trillion, two hundred forty-two billion, two hundred seventy-nine million, eight hundred sixty-nine thousand, six hundred forty-seven".