213819661 has 8 divisors (see below), whose sum is σ = 243399744. Its totient is φ = 185929920.

The previous prime is 213819647. The next prime is 213819689. The reversal of 213819661 is 166918312.

213819661 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 213819661 - 2⁵ = 213819629 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 213819661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213819601) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 422316 + ... + 422821.

It is an arithmetic number, because the mean of its divisors is an integer number (30424968).

Almost surely, 2^213819661 is an apocalyptic number.

It is an amenable number.

213819661 is a deficient number, since it is larger than the sum of its proper divisors (29580083).

213819661 is a wasteful number, since it uses less digits than its factorization.

213819661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 845171.

The product of its digits is 15552, while the sum is 37.

The square root of 213819661 is about 14622.5736790758. The cubic root of 213819661 is about 597.9743364340.

The spelling of 213819661 in words is "two hundred thirteen million, eight hundred nineteen thousand, six hundred sixty-one".