211663489 has 4 divisors (see below), whose sum is σ = 218962260. Its totient is φ = 204364720.

The previous prime is 211663483. The next prime is 211663499. The reversal of 211663489 is 984366112.

211663489 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.

It can be written as a sum of positive squares in 2 ways, for example, as 150307600 + 61355889 = 12260^2 + 7833^2 .

It is a cyclic number.

It is not a de Polignac number, because 211663489 - 2²¹ = 209566337 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (211663483) 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, 3649342 + ... + 3649399.

It is an arithmetic number, because the mean of its divisors is an integer number (54740565).

Almost surely, 2^211663489 is an apocalyptic number.

211663489 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

It is an amenable number.

211663489 is a deficient number, since it is larger than the sum of its proper divisors (7298771).

211663489 is an equidigital number, since it uses as much as digits as its factorization.

211663489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7298770.

The product of its digits is 62208, while the sum is 40.

The square root of 211663489 is about 14548.6593540436. The cubic root of 211663489 is about 595.9575373633.

The spelling of 211663489 in words is "two hundred eleven million, six hundred sixty-three thousand, four hundred eighty-nine".