1242556567 has 4 divisors (see below), whose sum is σ = 1420064656. Its totient is φ = 1065048480.

The previous prime is 1242556543. The next prime is 1242556573. The reversal of 1242556567 is 7656552421.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1242556567 - 2¹⁹ = 1242032279 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1242556507) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 88754034 + ... + 88754047.

It is an arithmetic number, because the mean of its divisors is an integer number (355016164).

Almost surely, 2^1242556567 is an apocalyptic number.

1242556567 is a deficient number, since it is larger than the sum of its proper divisors (177508089).

1242556567 is an equidigital number, since it uses as much as digits as its factorization.

1242556567 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 177508088.

The product of its digits is 504000, while the sum is 43.

The square root of 1242556567 is about 35249.9158438712. The cubic root of 1242556567 is about 1075.0749014333.

The spelling of 1242556567 in words is "one billion, two hundred forty-two million, five hundred fifty-six thousand, five hundred sixty-seven".