1242367681 has 4 divisors (see below), whose sum is σ = 1244919232. Its totient is φ = 1239816132.

The previous prime is 1242367669. The next prime is 1242367703. The reversal of 1242367681 is 1867632421.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1242367681 - 2¹⁷ = 1242236609 is a prime.

It is a super-2 number, since 2×1242367681² = 3086954909586635522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1242367601) 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 in 3 ways as a sum of consecutive naturals, for example, 1275045 + ... + 1276018.

It is an arithmetic number, because the mean of its divisors is an integer number (311229808).

Almost surely, 2^1242367681 is an apocalyptic number.

It is an amenable number.

1242367681 is a deficient number, since it is larger than the sum of its proper divisors (2551551).

1242367681 is an equidigital number, since it uses as much as digits as its factorization.

1242367681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2551550.

The product of its digits is 96768, while the sum is 40.

The square root of 1242367681 is about 35247.2365016039. The cubic root of 1242367681 is about 1075.0204231923.

The spelling of 1242367681 in words is "one billion, two hundred forty-two million, three hundred sixty-seven thousand, six hundred eighty-one".