213205545 has 48 divisors (see below), whose sum is σ = 428343552. Its totient is φ = 96082560.

The previous prime is 213205543. The next prime is 213205547. The reversal of 213205545 is 545502312.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (213205543) and next prime (213205547).

It is not a de Polignac number, because 213205545 - 2¹ = 213205543 is a prime.

It is not an unprimeable number, because it can be changed into a prime (213205543) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 17599 + ... + 27131.

It is an arithmetic number, because the mean of its divisors is an integer number (8923824).

Almost surely, 2^213205545 is an apocalyptic number.

It is an amenable number.

213205545 is an abundant number, since it is smaller than the sum of its proper divisors (215138007).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

213205545 is a wasteful number, since it uses less digits than its factorization.

213205545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9622 (or 9619 counting only the distinct ones).

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

The square root of 213205545 is about 14601.5596769660. The cubic root of 213205545 is about 597.4013025354.

Adding to 213205545 its reverse (545502312), we get a palindrome (758707857).

The spelling of 213205545 in words is "two hundred thirteen million, two hundred five thousand, five hundred forty-five".