243210131 has 2 divisors, whose sum is σ = 243210132. Its totient is φ = 243210130.

The previous prime is 243210103. The next prime is 243210161. The reversal of 243210131 is 131012342.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-243210131 is a prime.

It is a super-2 number, since 2×243210131² = 118302335642074322, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (243210161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121605065 + 121605066.

It is an arithmetic number, because the mean of its divisors is an integer number (121605066).

Almost surely, 2^243210131 is an apocalyptic number.

243210131 is a deficient number, since it is larger than the sum of its proper divisors (1).

243210131 is an equidigital number, since it uses as much as digits as its factorization.

243210131 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 243210131 is about 15595.1957666456. The cubic root of 243210131 is about 624.2049675596.

Adding to 243210131 its reverse (131012342), we get a palindrome (374222473).

The spelling of 243210131 in words is "two hundred forty-three million, two hundred ten thousand, one hundred thirty-one".