1242555609 has 8 divisors (see below), whose sum is σ = 1710184192. Its totient is φ = 801648720.

The previous prime is 1242555607. The next prime is 1242555623. The reversal of 1242555609 is 9065552421.

1242555609 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1242555609 - 2¹ = 1242555607 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1242555607) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6680314 + ... + 6680499.

It is an arithmetic number, because the mean of its divisors is an integer number (213773024).

Almost surely, 2^1242555609 is an apocalyptic number.

It is an amenable number.

1242555609 is a deficient number, since it is larger than the sum of its proper divisors (467628583).

1242555609 is a wasteful number, since it uses less digits than its factorization.

1242555609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13360847.

The product of its (nonzero) digits is 108000, while the sum is 39.

The square root of 1242555609 is about 35249.9022551836. The cubic root of 1242555609 is about 1075.0746251422.

The spelling of 1242555609 in words is "one billion, two hundred forty-two million, five hundred fifty-five thousand, six hundred nine".