684164213 has 4 divisors (see below), whose sum is σ = 690806688. Its totient is φ = 677521740.

The previous prime is 684164149. The next prime is 684164219. The reversal of 684164213 is 312461486.

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 not a de Polignac number, because 684164213 - 2⁶ = 684164149 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 (684164219) 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, 3321083 + ... + 3321288.

It is an arithmetic number, because the mean of its divisors is an integer number (172701672).

Almost surely, 2^684164213 is an apocalyptic number.

It is an amenable number.

684164213 is a deficient number, since it is larger than the sum of its proper divisors (6642475).

684164213 is a wasteful number, since it uses less digits than its factorization.

684164213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6642474.

The product of its digits is 27648, while the sum is 35.

The square root of 684164213 is about 26156.5328933328. The cubic root of 684164213 is about 881.1573155512.

The spelling of 684164213 in words is "six hundred eighty-four million, one hundred sixty-four thousand, two hundred thirteen".