213653 has 4 divisors (see below), whose sum is σ = 233088. Its totient is φ = 194220.

The previous prime is 213649. The next prime is 213659. The reversal of 213653 is 356312.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 213653 - 2² = 213649 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213659) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9701 + ... + 9722.

It is an arithmetic number, because the mean of its divisors is an integer number (58272).

2²¹³⁶⁵³ is an apocalyptic number.

It is an amenable number.

213653 is a deficient number, since it is larger than the sum of its proper divisors (19435).

213653 is a wasteful number, since it uses less digits than its factorization.

213653 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19434.

The product of its digits is 540, while the sum is 20.

The square root of 213653 is about 462.2261351330. The cubic root of 213653 is about 59.7818933037.

Adding to 213653 its reverse (356312), we get a palindrome (569965).

The spelling of 213653 in words is "two hundred thirteen thousand, six hundred fifty-three".