212642669 has 2 divisors, whose sum is σ = 212642670. Its totient is φ = 212642668.

The previous prime is 212642653. The next prime is 212642693. The reversal of 212642669 is 966246212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 206267044 + 6375625 = 14362^2 + 2525^2 .

It is a cyclic number.

It is not a de Polignac number, because 212642669 - 2⁴ = 212642653 is a prime.

It is a super-2 number, since 2×212642669² = 90433809358887122, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (212642569) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106321334 + 106321335.

It is an arithmetic number, because the mean of its divisors is an integer number (106321335).

Almost surely, 2^212642669 is an apocalyptic number.

It is an amenable number.

212642669 is a deficient number, since it is larger than the sum of its proper divisors (1).

212642669 is an equidigital number, since it uses as much as digits as its factorization.

212642669 is an evil number, because the sum of its binary digits is even.

The product of its digits is 62208, while the sum is 38.

The square root of 212642669 is about 14582.2724223627. The cubic root of 212642669 is about 596.8751135806.

The spelling of 212642669 in words is "two hundred twelve million, six hundred forty-two thousand, six hundred sixty-nine".