212256965 has 4 divisors (see below), whose sum is σ = 254708364. Its totient is φ = 169805568.

The previous prime is 212256953. The next prime is 212256971. The reversal of 212256965 is 569652212.

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 92179201 + 120077764 = 9601^2 + 10958^2 .

It is a cyclic number.

It is not a de Polignac number, because 212256965 - 2¹² = 212252869 is a prime.

It is a super-2 number, since 2×212256965² = 90106038382022450, which contains 22 as substring.

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, 21225692 + ... + 21225701.

It is an arithmetic number, because the mean of its divisors is an integer number (63677091).

Almost surely, 2^212256965 is an apocalyptic number.

It is an amenable number.

212256965 is a deficient number, since it is larger than the sum of its proper divisors (42451399).

212256965 is an equidigital number, since it uses as much as digits as its factorization.

212256965 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42451398.

The product of its digits is 64800, while the sum is 38.

The square root of 212256965 is about 14569.0413205537. The cubic root of 212256965 is about 596.5140125620.

The spelling of 212256965 in words is "two hundred twelve million, two hundred fifty-six thousand, nine hundred sixty-five".