1242633556 has 6 divisors (see below), whose sum is σ = 2174608730. Its totient is φ = 621316776.

The previous prime is 1242633529. The next prime is 1242633559. The reversal of 1242633556 is 6553362421.

It can be written as a sum of positive squares in only one way, i.e., 1069290000 + 173343556 = 32700^2 + 13166^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1242633559) 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, 155329191 + ... + 155329198.

Almost surely, 2^1242633556 is an apocalyptic number.

It is an amenable number.

1242633556 is a deficient number, since it is larger than the sum of its proper divisors (931975174).

1242633556 is a wasteful number, since it uses less digits than its factorization.

1242633556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 310658393 (or 310658391 counting only the distinct ones).

The product of its digits is 129600, while the sum is 37.

The square root of 1242633556 is about 35251.0078721162. The cubic root of 1242633556 is about 1075.0971049113.

Adding to 1242633556 its reverse (6553362421), we get a palindrome (7795995977).

The spelling of 1242633556 in words is "one billion, two hundred forty-two million, six hundred thirty-three thousand, five hundred fifty-six".