212056565 has 12 divisors (see below), whose sum is σ = 296013996. Its totient is φ = 145410048.

The previous prime is 212056553. The next prime is 212056571. The reversal of 212056565 is 565650212.

It can be written as a sum of positive squares in 2 ways, for example, as 25542916 + 186513649 = 5054^2 + 13657^2 .

It is not a de Polignac number, because 212056565 - 2⁸ = 212056309 is a prime.

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 (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 432524 + ... + 433013.

It is an arithmetic number, because the mean of its divisors is an integer number (24667833).

Almost surely, 2^212056565 is an apocalyptic number.

It is an amenable number.

212056565 is a deficient number, since it is larger than the sum of its proper divisors (83957431).

212056565 is an equidigital number, since it uses as much as digits as its factorization.

212056565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 865556 (or 865549 counting only the distinct ones).

The product of its (nonzero) digits is 18000, while the sum is 32.

The square root of 212056565 is about 14562.1620990841. The cubic root of 212056565 is about 596.3262228090.

It can be divided in two parts, 2120 and 56565, that added together give a palindrome (58685).

The spelling of 212056565 in words is "two hundred twelve million, fifty-six thousand, five hundred sixty-five".