212690965 has 4 divisors (see below), whose sum is σ = 255229164. Its totient is φ = 170152768.

The previous prime is 212690939. The next prime is 212690971. The reversal of 212690965 is 569096212.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 154306084 + 58384881 = 12422^2 + 7641^2 .

It is a cyclic number.

It is not a de Polignac number, because 212690965 - 2²⁵ = 179136533 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 21269092 + ... + 21269101.

It is an arithmetic number, because the mean of its divisors is an integer number (63807291).

Almost surely, 2^212690965 is an apocalyptic number.

It is an amenable number.

212690965 is a deficient number, since it is larger than the sum of its proper divisors (42538199).

212690965 is an equidigital number, since it uses as much as digits as its factorization.

212690965 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42538198.

The product of its (nonzero) digits is 58320, while the sum is 40.

The square root of 212690965 is about 14583.9283116724. The cubic root of 212690965 is about 596.9202981438.

The spelling of 212690965 in words is "two hundred twelve million, six hundred ninety thousand, nine hundred sixty-five".