211147949 has 4 divisors (see below), whose sum is σ = 212219964. Its totient is φ = 210075936.

The previous prime is 211147943. The next prime is 211147967. The reversal of 211147949 is 949741112.

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 161544100 + 49603849 = 12710^2 + 7043^2 .

It is a cyclic number.

It is not a de Polignac number, because 211147949 - 2¹⁶ = 211082413 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 (211147943) 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, 535712 + ... + 536105.

It is an arithmetic number, because the mean of its divisors is an integer number (53054991).

Almost surely, 2^211147949 is an apocalyptic number.

It is an amenable number.

211147949 is a deficient number, since it is larger than the sum of its proper divisors (1072015).

211147949 is a wasteful number, since it uses less digits than its factorization.

211147949 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1072014.

The product of its digits is 18144, while the sum is 38.

The square root of 211147949 is about 14530.9307685365. The cubic root of 211147949 is about 595.4732942971.

The spelling of 211147949 in words is "two hundred eleven million, one hundred forty-seven thousand, nine hundred forty-nine".