210949 has 4 divisors (see below), whose sum is σ = 212236. Its totient is φ = 209664.

The previous prime is 210943. The next prime is 210961. The reversal of 210949 is 949012.

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

It can be written as a sum of positive squares in 2 ways, for example, as 145924 + 65025 = 382^2 + 255^2 .

It is a cyclic number.

It is not a de Polignac number, because 210949 - 2⁹ = 210437 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210943) 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 3 ways as a sum of consecutive naturals, for example, 354 + ... + 739.

It is an arithmetic number, because the mean of its divisors is an integer number (53059).

2²¹⁰⁹⁴⁹ is an apocalyptic number.

It is an amenable number.

210949 is a deficient number, since it is larger than the sum of its proper divisors (1287).

210949 is a wasteful number, since it uses less digits than its factorization.

210949 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1286.

The product of its (nonzero) digits is 648, while the sum is 25.

The square root of 210949 is about 459.2918462155. The cubic root of 210949 is about 59.5286212136.

Multiplying 210949 by its sum of digits (25), we get a palindrome (5273725).

The spelling of 210949 in words is "two hundred ten thousand, nine hundred forty-nine".