212865869 has 2 divisors, whose sum is σ = 212865870. Its totient is φ = 212865868.

The previous prime is 212865833. The next prime is 212865899. The reversal of 212865869 is 968568212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 169963369 + 42902500 = 13037^2 + 6550^2 .

It is a cyclic number.

It is not a de Polignac number, because 212865869 - 2⁸ = 212865613 is a prime.

It is a super-2 number, since 2×212865869² = 90623756370250322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (212865899) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106432934 + 106432935.

It is an arithmetic number, because the mean of its divisors is an integer number (106432935).

Almost surely, 2^212865869 is an apocalyptic number.

It is an amenable number.

212865869 is a deficient number, since it is larger than the sum of its proper divisors (1).

212865869 is an equidigital number, since it uses as much as digits as its factorization.

212865869 is an evil number, because the sum of its binary digits is even.

The product of its digits is 414720, while the sum is 47.

The square root of 212865869 is about 14589.9235433226. The cubic root of 212865869 is about 597.0838768560.

The spelling of 212865869 in words is "two hundred twelve million, eight hundred sixty-five thousand, eight hundred sixty-nine".