211851149 has 4 divisors (see below), whose sum is σ = 214835040. Its totient is φ = 208867260.

The previous prime is 211851131. The next prime is 211851163. The reversal of 211851149 is 941158112.

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 a de Polignac number, because none of the positive numbers 2^k-211851149 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 (211851169) 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 3 ways as a sum of consecutive naturals, for example, 1491839 + ... + 1491980.

It is an arithmetic number, because the mean of its divisors is an integer number (53708760).

Almost surely, 2^211851149 is an apocalyptic number.

It is an amenable number.

211851149 is a deficient number, since it is larger than the sum of its proper divisors (2983891).

211851149 is an equidigital number, since it uses as much as digits as its factorization.

211851149 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2983890.

The product of its digits is 2880, while the sum is 32.

The square root of 211851149 is about 14555.1073166775. The cubic root of 211851149 is about 596.1336098589.

The spelling of 211851149 in words is "two hundred eleven million, eight hundred fifty-one thousand, one hundred forty-nine".