213145 has 8 divisors (see below), whose sum is σ = 261504. Its totient is φ = 166704.

The previous prime is 213139. The next prime is 213149. The reversal of 213145 is 541312.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 213145 - 2⁹ = 212633 is a prime.

It is an Ulam number.

It is a Duffinian number.

213145 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (213149) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 219 + ... + 688.

It is an arithmetic number, because the mean of its divisors is an integer number (32688).

2²¹³¹⁴⁵ is an apocalyptic number.

It is an amenable number.

213145 is a deficient number, since it is larger than the sum of its proper divisors (48359).

213145 is an equidigital number, since it uses as much as digits as its factorization.

213145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 959.

The product of its digits is 120, while the sum is 16.

The square root of 213145 is about 461.6762935218. The cubic root of 213145 is about 59.7344748212.

Adding to 213145 its reverse (541312), we get a palindrome (754457).

The spelling of 213145 in words is "two hundred thirteen thousand, one hundred forty-five".