212539993 has 2 divisors, whose sum is σ = 212539994. Its totient is φ = 212539992.

The previous prime is 212539931. The next prime is 212539997. The reversal of 212539993 is 399935212.

212539993 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 can be written as a sum of positive squares in only one way, i.e., 109558089 + 102981904 = 10467^2 + 10148^2 .

It is a cyclic number.

It is not a de Polignac number, because 212539993 - 2¹⁷ = 212408921 is a prime.

It is not a weakly prime, because it can be changed into another prime (212539997) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106269996 + 106269997.

It is an arithmetic number, because the mean of its divisors is an integer number (106269997).

Almost surely, 2^212539993 is an apocalyptic number.

It is an amenable number.

212539993 is a deficient number, since it is larger than the sum of its proper divisors (1).

212539993 is an equidigital number, since it uses as much as digits as its factorization.

212539993 is an evil number, because the sum of its binary digits is even.

The product of its digits is 131220, while the sum is 43.

The square root of 212539993 is about 14578.7514211609. The cubic root of 212539993 is about 596.7790296729.

The spelling of 212539993 in words is "two hundred twelve million, five hundred thirty-nine thousand, nine hundred ninety-three".