211713641 has 4 divisors (see below), whose sum is σ = 215708292. Its totient is φ = 207718992.

The previous prime is 211713629. The next prime is 211713679. The reversal of 211713641 is 146317112.

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 116553616 + 95160025 = 10796^2 + 9755^2 .

It is a cyclic number.

It is not a de Polignac number, because 211713641 - 2¹⁰ = 211712617 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 211713641.

It is not an unprimeable number, because it can be changed into a prime (211713611) 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, 1997246 + ... + 1997351.

It is an arithmetic number, because the mean of its divisors is an integer number (53927073).

Almost surely, 2^211713641 is an apocalyptic number.

It is an amenable number.

211713641 is a deficient number, since it is larger than the sum of its proper divisors (3994651).

211713641 is an equidigital number, since it uses as much as digits as its factorization.

211713641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3994650.

The product of its digits is 1008, while the sum is 26.

The square root of 211713641 is about 14550.3828471968. The cubic root of 211713641 is about 596.0046027977.

The spelling of 211713641 in words is "two hundred eleven million, seven hundred thirteen thousand, six hundred forty-one".