212305545 has 24 divisors (see below), whose sum is σ = 374943816. Its totient is φ = 111091968.

The previous prime is 212305531. The next prime is 212305631. The reversal of 212305545 is 545503212.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 24176889 + 188128656 = 4917^2 + 13716^2 .

It is not a de Polignac number, because 212305545 - 2¹³ = 212297353 is a prime.

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 23 ways as a sum of consecutive naturals, for example, 42124 + ... + 46893.

It is an arithmetic number, because the mean of its divisors is an integer number (15622659).

Almost surely, 2^212305545 is an apocalyptic number.

It is an amenable number.

212305545 is a deficient number, since it is larger than the sum of its proper divisors (162638271).

212305545 is a wasteful number, since it uses less digits than its factorization.

212305545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89081 (or 89078 counting only the distinct ones).

The product of its (nonzero) digits is 6000, while the sum is 27.

The square root of 212305545 is about 14570.7084590970. The cubic root of 212305545 is about 596.5595178456.

Adding to 212305545 its reverse (545503212), we get a palindrome (757808757).

The spelling of 212305545 in words is "two hundred twelve million, three hundred five thousand, five hundred forty-five".