211528949 has 4 divisors (see below), whose sum is σ = 213050880. Its totient is φ = 210007020.

The previous prime is 211528939. The next prime is 211528969. The reversal of 211528949 is 949825112.

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 211528949 - 2²⁰ = 210480373 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211528939) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 760757 + ... + 761034.

It is an arithmetic number, because the mean of its divisors is an integer number (53262720).

Almost surely, 2^211528949 is an apocalyptic number.

It is an amenable number.

211528949 is a deficient number, since it is larger than the sum of its proper divisors (1521931).

211528949 is a wasteful number, since it uses less digits than its factorization.

211528949 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1521930.

The product of its digits is 51840, while the sum is 41.

The square root of 211528949 is about 14544.0348253158. The cubic root of 211528949 is about 595.8312407879.

The spelling of 211528949 in words is "two hundred eleven million, five hundred twenty-eight thousand, nine hundred forty-nine".