243642071 has 4 divisors (see below), whose sum is σ = 246007632. Its totient is φ = 241276512.

The previous prime is 243642067. The next prime is 243642107. The reversal of 243642071 is 170246342.

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 243642071 - 2² = 243642067 is a prime.

It is a super-2 number, since 2×243642071² = 118722917522338082, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243642041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1182626 + ... + 1182831.

It is an arithmetic number, because the mean of its divisors is an integer number (61501908).

Almost surely, 2^243642071 is an apocalyptic number.

243642071 is a deficient number, since it is larger than the sum of its proper divisors (2365561).

243642071 is a wasteful number, since it uses less digits than its factorization.

243642071 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2365560.

The product of its (nonzero) digits is 8064, while the sum is 29.

The square root of 243642071 is about 15609.0381189873. The cubic root of 243642071 is about 624.5742773355.

The spelling of 243642071 in words is "two hundred forty-three million, six hundred forty-two thousand, seventy-one".