243340200131 has 4 divisors (see below), whose sum is σ = 278103085872. Its totient is φ = 208577314392.

The previous prime is 243340200113. The next prime is 243340200139. The reversal of 243340200131 is 131002043342.

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 243340200131 - 2²² = 243336005827 is a prime.

It is a super-2 number, since 2×243340200131² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 243340200097 and 243340200106.

It is not an unprimeable number, because it can be changed into a prime (243340200139) 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, 17381442860 + ... + 17381442873.

It is an arithmetic number, because the mean of its divisors is an integer number (69525771468).

Almost surely, 2^243340200131 is an apocalyptic number.

243340200131 is a deficient number, since it is larger than the sum of its proper divisors (34762885741).

243340200131 is an equidigital number, since it uses as much as digits as its factorization.

243340200131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34762885740.

The product of its (nonzero) digits is 1728, while the sum is 23.

Adding to 243340200131 its reverse (131002043342), we get a palindrome (374342243473).

The spelling of 243340200131 in words is "two hundred forty-three billion, three hundred forty million, two hundred thousand, one hundred thirty-one".