213755 has 4 divisors (see below), whose sum is σ = 256512. Its totient is φ = 171000.

The previous prime is 213751. The next prime is 213791. The reversal of 213755 is 557312.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 213755 - 2² = 213751 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 213755.

It is not an unprimeable number, because it can be changed into a prime (213751) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21371 + ... + 21380.

It is an arithmetic number, because the mean of its divisors is an integer number (64128).

2²¹³⁷⁵⁵ is an apocalyptic number.

213755 is a deficient number, since it is larger than the sum of its proper divisors (42757).

213755 is an equidigital number, since it uses as much as digits as its factorization.

213755 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42756.

The product of its digits is 1050, while the sum is 23.

The square root of 213755 is about 462.3364575718. The cubic root of 213755 is about 59.7914052740.

The spelling of 213755 in words is "two hundred thirteen thousand, seven hundred fifty-five".