212539931 has 2 divisors, whose sum is σ = 212539932. Its totient is φ = 212539930.

The previous prime is 212539913. The next prime is 212539993. The reversal of 212539931 is 139935212.

212539931 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

Together with previous prime (212539913) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 212539931 - 2⁶ = 212539867 is a prime.

It is a super-2 number, since 2×212539931² = 90346444538969522, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 212539891 and 212539900.

It is not a weakly prime, because it can be changed into another prime (212533931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106269965 + 106269966.

It is an arithmetic number, because the mean of its divisors is an integer number (106269966).

Almost surely, 2^212539931 is an apocalyptic number.

212539931 is a deficient number, since it is larger than the sum of its proper divisors (1).

212539931 is an equidigital number, since it uses as much as digits as its factorization.

212539931 is an evil number, because the sum of its binary digits is even.

The product of its digits is 14580, while the sum is 35.

The square root of 212539931 is about 14578.7492947783. The cubic root of 212539931 is about 596.7789716441.

The spelling of 212539931 in words is "two hundred twelve million, five hundred thirty-nine thousand, nine hundred thirty-one".