211979249 has 4 divisors (see below), whose sum is σ = 213089280. Its totient is φ = 210869220.

The previous prime is 211979231. The next prime is 211979267. The reversal of 211979249 is 942979112.

211979249 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 an interprime number because it is at equal distance from previous prime (211979231) and next prime (211979267).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-211979249 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (211919249) 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, 554729 + ... + 555110.

It is an arithmetic number, because the mean of its divisors is an integer number (53272320).

Almost surely, 2^211979249 is an apocalyptic number.

It is an amenable number.

211979249 is a deficient number, since it is larger than the sum of its proper divisors (1110031).

211979249 is a wasteful number, since it uses less digits than its factorization.

211979249 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1110030.

The product of its digits is 81648, while the sum is 44.

The square root of 211979249 is about 14559.5071688571. The cubic root of 211979249 is about 596.2537403203.

The spelling of 211979249 in words is "two hundred eleven million, nine hundred seventy-nine thousand, two hundred forty-nine".