684201213 has 6 divisors (see below), whose sum is σ = 988290654. Its totient is φ = 456134136.

The previous prime is 684201181. The next prime is 684201239. The reversal of 684201213 is 312102486.

It can be written as a sum of positive squares in only one way, i.e., 678237849 + 5963364 = 26043^2 + 2442^2 .

It is not a de Polignac number, because 684201213 - 2⁵ = 684201181 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (684201283) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 38011170 + ... + 38011187.

It is an arithmetic number, because the mean of its divisors is an integer number (164715109).

Almost surely, 2^684201213 is an apocalyptic number.

It is an amenable number.

684201213 is a deficient number, since it is larger than the sum of its proper divisors (304089441).

684201213 is a wasteful number, since it uses less digits than its factorization.

684201213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76022363 (or 76022360 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 27.

The square root of 684201213 is about 26157.2401640540. The cubic root of 684201213 is about 881.1731997655.

Adding to 684201213 its reverse (312102486), we get a palindrome (996303699).

The spelling of 684201213 in words is "six hundred eighty-four million, two hundred one thousand, two hundred thirteen".