1243055747 has 2 divisors, whose sum is σ = 1243055748. Its totient is φ = 1243055746.

The previous prime is 1243055741. The next prime is 1243055761. The reversal of 1243055747 is 7475503421.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1243055747 - 2⁴ = 1243055731 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1243055747.

It is not a weakly prime, because it can be changed into another prime (1243055741) 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, 621527873 + 621527874.

It is an arithmetic number, because the mean of its divisors is an integer number (621527874).

Almost surely, 2^1243055747 is an apocalyptic number.

1243055747 is a deficient number, since it is larger than the sum of its proper divisors (1).

1243055747 is an equidigital number, since it uses as much as digits as its factorization.

1243055747 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 117600, while the sum is 38.

The square root of 1243055747 is about 35256.9957171623. The cubic root of 1243055747 is about 1075.2188476742.

The spelling of 1243055747 in words is "one billion, two hundred forty-three million, fifty-five thousand, seven hundred forty-seven".