1242231547 has 2 divisors, whose sum is σ = 1242231548. Its totient is φ = 1242231546.

The previous prime is 1242231527. The next prime is 1242231553. The reversal of 1242231547 is 7451322421.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (7451322421) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1242231547 - 2¹⁵ = 1242198779 is a prime.

It is not a weakly prime, because it can be changed into another prime (1242231527) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 621115773 + 621115774.

It is an arithmetic number, because the mean of its divisors is an integer number (621115774).

Almost surely, 2^1242231547 is an apocalyptic number.

1242231547 is a deficient number, since it is larger than the sum of its proper divisors (1).

1242231547 is an equidigital number, since it uses as much as digits as its factorization.

1242231547 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 13440, while the sum is 31.

The square root of 1242231547 is about 35245.3053185811. The cubic root of 1242231547 is about 1074.9811561867.

Adding to 1242231547 its reverse (7451322421), we get a palindrome (8693553968).

The spelling of 1242231547 in words is "one billion, two hundred forty-two million, two hundred thirty-one thousand, five hundred forty-seven".