1242501779 has 2 divisors, whose sum is σ = 1242501780. Its totient is φ = 1242501778.

The previous prime is 1242501721. The next prime is 1242501787. The reversal of 1242501779 is 9771052421.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1242501779 is a prime.

It is not a weakly prime, because it can be changed into another prime (1242501719) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 621250889 + 621250890.

It is an arithmetic number, because the mean of its divisors is an integer number (621250890).

Almost surely, 2^1242501779 is an apocalyptic number.

1242501779 is a deficient number, since it is larger than the sum of its proper divisors (1).

1242501779 is an equidigital number, since it uses as much as digits as its factorization.

1242501779 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 35280, while the sum is 38.

The square root of 1242501779 is about 35249.1386986973. The cubic root of 1242501779 is about 1075.0591001220.

The spelling of 1242501779 in words is "one billion, two hundred forty-two million, five hundred one thousand, seven hundred seventy-nine".