204979213 has 4 divisors (see below), whose sum is σ = 209978748. Its totient is φ = 199979680.

The previous prime is 204979211. The next prime is 204979241. The reversal of 204979213 is 312979402.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 312979402 = 2 ⋅156489701.

It can be written as a sum of positive squares in 2 ways, for example, as 66634569 + 138344644 = 8163^2 + 11762^2 .

It is a cyclic number.

It is not a de Polignac number, because 204979213 - 2¹ = 204979211 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 (204979211) 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, 2499706 + ... + 2499787.

It is an arithmetic number, because the mean of its divisors is an integer number (52494687).

Almost surely, 2^204979213 is an apocalyptic number.

It is an amenable number.

204979213 is a deficient number, since it is larger than the sum of its proper divisors (4999535).

204979213 is an equidigital number, since it uses as much as digits as its factorization.

204979213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4999534.

The product of its (nonzero) digits is 27216, while the sum is 37.

The square root of 204979213 is about 14317.0951313456. The cubic root of 204979213 is about 589.6169235977.

The spelling of 204979213 in words is "two hundred four million, nine hundred seventy-nine thousand, two hundred thirteen".