1242655747 has 2 divisors, whose sum is σ = 1242655748. Its totient is φ = 1242655746.

The previous prime is 1242655723. The next prime is 1242655751. The reversal of 1242655747 is 7475562421.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1242655747 - 2¹⁹ = 1242131459 is a prime.

It is not a weakly prime, because it can be changed into another prime (1242655717) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 621327873 + 621327874.

It is an arithmetic number, because the mean of its divisors is an integer number (621327874).

Almost surely, 2^1242655747 is an apocalyptic number.

1242655747 is a deficient number, since it is larger than the sum of its proper divisors (1).

1242655747 is an equidigital number, since it uses as much as digits as its factorization.

1242655747 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 470400, while the sum is 43.

The square root of 1242655747 is about 35251.3226276689. The cubic root of 1242655747 is about 1075.1035045823.

The spelling of 1242655747 in words is "one billion, two hundred forty-two million, six hundred fifty-five thousand, seven hundred forty-seven".