212539957 has 4 divisors (see below), whose sum is σ = 242902816. Its totient is φ = 182177100.

The previous prime is 212539931. The next prime is 212539993. The reversal of 212539957 is 759935212.

212539957 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 212539957 - 2¹⁹ = 212015669 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212539907) 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, 15181419 + ... + 15181432.

It is an arithmetic number, because the mean of its divisors is an integer number (60725704).

Almost surely, 2^212539957 is an apocalyptic number.

It is an amenable number.

212539957 is a deficient number, since it is larger than the sum of its proper divisors (30362859).

212539957 is an equidigital number, since it uses as much as digits as its factorization.

212539957 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30362858.

The product of its digits is 170100, while the sum is 43.

The square root of 212539957 is about 14578.7501864872. The cubic root of 212539957 is about 596.7789959788.

The spelling of 212539957 in words is "two hundred twelve million, five hundred thirty-nine thousand, nine hundred fifty-seven".