242143661 has 4 divisors (see below), whose sum is σ = 244050432. Its totient is φ = 240236892.

The previous prime is 242143637. The next prime is 242143679. The reversal of 242143661 is 166341242.

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 a de Polignac number, because none of the positive numbers 2^k-242143661 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 (242143691) 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, 953195 + ... + 953448.

It is an arithmetic number, because the mean of its divisors is an integer number (61012608).

Almost surely, 2^242143661 is an apocalyptic number.

It is an amenable number.

242143661 is a deficient number, since it is larger than the sum of its proper divisors (1906771).

242143661 is a wasteful number, since it uses less digits than its factorization.

242143661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1906770.

The product of its digits is 6912, while the sum is 29.

The square root of 242143661 is about 15560.9659404550. The cubic root of 242143661 is about 623.2912566245.

The spelling of 242143661 in words is "two hundred forty-two million, one hundred forty-three thousand, six hundred sixty-one".