212663889 has 9 divisors (see below), whose sum is σ = 307244379. Its totient is φ = 141746760.

The previous prime is 212663849. The next prime is 212663909. The reversal of 212663889 is 988366212.

The square root of 212663889 is 14583.

It is a perfect power (a square), and thus also a powerful number.

212663889 is a `hidden beast` number, since 2 + 1 + 2 + 6 + 638 + 8 + 9 = 666.

It can be written as a sum of positive squares in only one way, i.e., 195524289 + 17139600 = 13983^2 + 4140^2 .

It is a tau number, because it is divible by the number of its divisors (9).

It is not a de Polignac number, because 212663889 - 2¹³ = 212655697 is a prime.

It is not an unprimeable number, because it can be changed into a prime (212663849) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 41319 + ... + 46179.

Almost surely, 2^212663889 is an apocalyptic number.

212663889 is the 14583-rd square number.

212663889 is the 7292-nd centered octagonal number.

It is an amenable number.

212663889 is a deficient number, since it is larger than the sum of its proper divisors (94580490).

212663889 is an frugal number, since it uses more digits than its factorization.

212663889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9728 (or 4864 counting only the distinct ones).

The product of its digits is 248832, while the sum is 45.

The cubic root of 212663889 is about 596.8949673391.

The spelling of 212663889 in words is "two hundred twelve million, six hundred sixty-three thousand, eight hundred eighty-nine".