212831243 has 2 divisors, whose sum is σ = 212831244. Its totient is φ = 212831242.

The previous prime is 212831221. The next prime is 212831249. The reversal of 212831243 is 342138212.

212831243 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-212831243 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (212831249) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106415621 + 106415622.

It is an arithmetic number, because the mean of its divisors is an integer number (106415622).

Almost surely, 2^212831243 is an apocalyptic number.

212831243 is a deficient number, since it is larger than the sum of its proper divisors (1).

212831243 is an equidigital number, since it uses as much as digits as its factorization.

212831243 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2304, while the sum is 26.

The square root of 212831243 is about 14588.7368541625. The cubic root of 212831243 is about 597.0515000553.

Adding to 212831243 its reverse (342138212), we get a palindrome (554969455).

The spelling of 212831243 in words is "two hundred twelve million, eight hundred thirty-one thousand, two hundred forty-three".