213173565 has 48 divisors (see below), whose sum is σ = 380716224. Its totient is φ = 101756160.

The previous prime is 213173561. The next prime is 213173593. The reversal of 213173565 is 565371312.

It is not a de Polignac number, because 213173565 - 2² = 213173561 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213173561) 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, 120729 + ... + 122481.

It is an arithmetic number, because the mean of its divisors is an integer number (7931588).

Almost surely, 2^213173565 is an apocalyptic number.

It is an amenable number.

213173565 is a deficient number, since it is larger than the sum of its proper divisors (167542659).

213173565 is a wasteful number, since it uses less digits than its factorization.

213173565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1850 (or 1839 counting only the distinct ones).

The product of its digits is 18900, while the sum is 33.

The square root of 213173565 is about 14600.4645474040. The cubic root of 213173565 is about 597.3714317536.

The spelling of 213173565 in words is "two hundred thirteen million, one hundred seventy-three thousand, five hundred sixty-five".