211856949 has 6 divisors (see below), whose sum is σ = 306015606. Its totient is φ = 141237960.

The previous prime is 211856927. The next prime is 211856969. The reversal of 211856949 is 949658112.

It can be written as a sum of positive squares in only one way, i.e., 211702500 + 154449 = 14550^2 + 393^2 .

It is not a de Polignac number, because 211856949 - 2⁵ = 211856917 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211856969) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 11769822 + ... + 11769839.

It is an arithmetic number, because the mean of its divisors is an integer number (51002601).

Almost surely, 2^211856949 is an apocalyptic number.

It is an amenable number.

211856949 is a deficient number, since it is larger than the sum of its proper divisors (94158657).

211856949 is a wasteful number, since it uses less digits than its factorization.

211856949 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23539667 (or 23539664 counting only the distinct ones).

The product of its digits is 155520, while the sum is 45.

The square root of 211856949 is about 14555.3065580908. The cubic root of 211856949 is about 596.1390500676.

The spelling of 211856949 in words is "two hundred eleven million, eight hundred fifty-six thousand, nine hundred forty-nine".