1242673249 has 2 divisors, whose sum is σ = 1242673250. Its totient is φ = 1242673248.

The previous prime is 1242673247. The next prime is 1242673291. The reversal of 1242673249 is 9423762421.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1027523025 + 215150224 = 32055^2 + 14668^2 .

It is an emirp because it is prime and its reverse (9423762421) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1242673249 - 2¹ = 1242673247 is a prime.

Together with 1242673247, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1242673247) 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, 621336624 + 621336625.

It is an arithmetic number, because the mean of its divisors is an integer number (621336625).

Almost surely, 2^1242673249 is an apocalyptic number.

It is an amenable number.

1242673249 is a deficient number, since it is larger than the sum of its proper divisors (1).

1242673249 is an equidigital number, since it uses as much as digits as its factorization.

1242673249 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 145152, while the sum is 40.

The square root of 1242673249 is about 35251.5708727994. The cubic root of 1242673249 is about 1075.1085519371.

The spelling of 1242673249 in words is "one billion, two hundred forty-two million, six hundred seventy-three thousand, two hundred forty-nine".