212440545 has 12 divisors (see below), whose sum is σ = 368230356. Its totient is φ = 113301600.

The previous prime is 212440537. The next prime is 212440549. The reversal of 212440545 is 545044212.

212440545 is a `hidden beast` number, since 212 + 4 + 405 + 45 = 666.

212440545 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 96059601 + 116380944 = 9801^2 + 10788^2 .

It is not a de Polignac number, because 212440545 - 2³ = 212440537 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (212440549) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2360406 + ... + 2360495.

It is an arithmetic number, because the mean of its divisors is an integer number (30685863).

Almost surely, 2^212440545 is an apocalyptic number.

It is an amenable number.

212440545 is a deficient number, since it is larger than the sum of its proper divisors (155789811).

212440545 is a wasteful number, since it uses less digits than its factorization.

212440545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4720912 (or 4720909 counting only the distinct ones).

The product of its (nonzero) digits is 6400, while the sum is 27.

The square root of 212440545 is about 14575.3403047750. The cubic root of 212440545 is about 596.6859370131.

Adding to 212440545 its reverse (545044212), we get a palindrome (757484757).

The spelling of 212440545 in words is "two hundred twelve million, four hundred forty thousand, five hundred forty-five".