1242265679 has 2 divisors, whose sum is σ = 1242265680. Its totient is φ = 1242265678.

The previous prime is 1242265669. The next prime is 1242265681. The reversal of 1242265679 is 9765622421.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1242265679 is a prime.

Together with 1242265681, 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 (1242265669) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 621132839 + 621132840.

It is an arithmetic number, because the mean of its divisors is an integer number (621132840).

Almost surely, 2^1242265679 is an apocalyptic number.

1242265679 is a deficient number, since it is larger than the sum of its proper divisors (1).

1242265679 is an equidigital number, since it uses as much as digits as its factorization.

1242265679 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 362880, while the sum is 44.

The square root of 1242265679 is about 35245.7895215868. The cubic root of 1242265679 is about 1074.9910016193.

The spelling of 1242265679 in words is "one billion, two hundred forty-two million, two hundred sixty-five thousand, six hundred seventy-nine".