212980869 has 12 divisors (see below), whose sum is σ = 307999692. Its totient is φ = 141820800.

The previous prime is 212980847. The next prime is 212980883. The reversal of 212980869 is 968089212.

It can be written as a sum of positive squares in 2 ways, for example, as 18378369 + 194602500 = 4287^2 + 13950^2 .

It is not a de Polignac number, because 212980869 - 2⁸ = 212980613 is a prime.

It is a super-2 number, since 2×212980869² = 90721701119990322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212980969) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5502 + ... + 21359.

It is an arithmetic number, because the mean of its divisors is an integer number (25666641).

Almost surely, 2^212980869 is an apocalyptic number.

It is an amenable number.

212980869 is a deficient number, since it is larger than the sum of its proper divisors (95018823).

212980869 is a wasteful number, since it uses less digits than its factorization.

212980869 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27748 (or 27745 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 45.

The square root of 212980869 is about 14593.8640873485. The cubic root of 212980869 is about 597.1913816188.

The spelling of 212980869 in words is "two hundred twelve million, nine hundred eighty thousand, eight hundred sixty-nine".