212531311 has 2 divisors, whose sum is σ = 212531312. Its totient is φ = 212531310.

The previous prime is 212531273. The next prime is 212531351. The reversal of 212531311 is 113135212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 212531311 - 2¹³ = 212523119 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (212531351) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106265655 + 106265656.

It is an arithmetic number, because the mean of its divisors is an integer number (106265656).

Almost surely, 2^212531311 is an apocalyptic number.

212531311 is a deficient number, since it is larger than the sum of its proper divisors (1).

212531311 is an equidigital number, since it uses as much as digits as its factorization.

212531311 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 180, while the sum is 19.

The square root of 212531311 is about 14578.4536559952. The cubic root of 212531311 is about 596.7709036633.

Adding to 212531311 its reverse (113135212), we get a palindrome (325666523).

The spelling of 212531311 in words is "two hundred twelve million, five hundred thirty-one thousand, three hundred eleven".