1243054609 has 2 divisors, whose sum is σ = 1243054610. Its totient is φ = 1243054608.

The previous prime is 1243054607. The next prime is 1243054669. The reversal of 1243054609 is 9064503421.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1207771009 + 35283600 = 34753^2 + 5940^2 .

It is an emirp because it is prime and its reverse (9064503421) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1243054609 - 2¹ = 1243054607 is a prime.

It is a super-2 number, since 2×1243054609² = 3090369521912285762, which contains 22 as substring.

Together with 1243054607, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1243054601) 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, 621527304 + 621527305.

It is an arithmetic number, because the mean of its divisors is an integer number (621527305).

Almost surely, 2^1243054609 is an apocalyptic number.

It is an amenable number.

1243054609 is a deficient number, since it is larger than the sum of its proper divisors (1).

1243054609 is an equidigital number, since it uses as much as digits as its factorization.

1243054609 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 25920, while the sum is 34.

The square root of 1243054609 is about 35256.9795785175. The cubic root of 1243054609 is about 1075.2185195582.

The spelling of 1243054609 in words is "one billion, two hundred forty-three million, fifty-four thousand, six hundred nine".