242143531 has 4 divisors (see below), whose sum is σ = 276735472. Its totient is φ = 207551592.

The previous prime is 242143523. The next prime is 242143537. The reversal of 242143531 is 135341242.

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 242143531 - 2³ = 242143523 is a prime.

It is a super-2 number, since 2×242143531² = 117266979210295922, 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 = 242143496 and 242143505.

It is not an unprimeable number, because it can be changed into a prime (242143537) 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, 17295960 + ... + 17295973.

It is an arithmetic number, because the mean of its divisors is an integer number (69183868).

Almost surely, 2^242143531 is an apocalyptic number.

242143531 is a deficient number, since it is larger than the sum of its proper divisors (34591941).

242143531 is an equidigital number, since it uses as much as digits as its factorization.

242143531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34591940.

The product of its digits is 2880, while the sum is 25.

The square root of 242143531 is about 15560.9617633358. The cubic root of 242143531 is about 623.2911450821.

Adding to 242143531 its reverse (135341242), we get a palindrome (377484773).

The spelling of 242143531 in words is "two hundred forty-two million, one hundred forty-three thousand, five hundred thirty-one".