242123131 has 4 divisors (see below), whose sum is σ = 244386072. Its totient is φ = 239860192.

The previous prime is 242123111. The next prime is 242123143. The reversal of 242123131 is 131321242.

It is a happy number.

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 242123131 - 2¹¹ = 242121083 is a prime.

It is a super-2 number, since 2×242123131² = 117247221130486322, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 242123099 and 242123108.

It is not an unprimeable number, because it can be changed into a prime (242123111) 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, 1131310 + ... + 1131523.

It is an arithmetic number, because the mean of its divisors is an integer number (61096518).

Almost surely, 2^242123131 is an apocalyptic number.

242123131 is a deficient number, since it is larger than the sum of its proper divisors (2262941).

242123131 is a wasteful number, since it uses less digits than its factorization.

242123131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2262940.

The product of its digits is 288, while the sum is 19.

The square root of 242123131 is about 15560.3062630528. The cubic root of 242123131 is about 623.2736410059.

Adding to 242123131 its reverse (131321242), we get a palindrome (373444373).

It can be divided in two parts, 2421 and 23131, that added together give a palindrome (25552).

The spelling of 242123131 in words is "two hundred forty-two million, one hundred twenty-three thousand, one hundred thirty-one".