212606345 has 12 divisors (see below), whose sum is σ = 296781444. Its totient is φ = 145787040.

The previous prime is 212606341. The next prime is 212606347. The reversal of 212606345 is 543606212.

It can be written as a sum of positive squares in 2 ways, for example, as 76930441 + 135675904 = 8771^2 + 11648^2 .

It is not a de Polignac number, because 212606345 - 2² = 212606341 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (212606341) 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, 433646 + ... + 434135.

It is an arithmetic number, because the mean of its divisors is an integer number (24731787).

Almost surely, 2^212606345 is an apocalyptic number.

It is an amenable number.

212606345 is a deficient number, since it is larger than the sum of its proper divisors (84175099).

212606345 is an equidigital number, since it uses as much as digits as its factorization.

212606345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 867800 (or 867793 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 29.

The square root of 212606345 is about 14581.0268842767. The cubic root of 212606345 is about 596.8411252213.

The spelling of 212606345 in words is "two hundred twelve million, six hundred six thousand, three hundred forty-five".