208604621 has 2 divisors, whose sum is σ = 208604622. Its totient is φ = 208604620.

The previous prime is 208604593. The next prime is 208604633. The reversal of 208604621 is 126406802.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 158407396 + 50197225 = 12586^2 + 7085^2 .

It is a cyclic number.

It is not a de Polignac number, because 208604621 - 2¹⁰ = 208603597 is a prime.

It is a Chen prime.

It is equal to p_11528606 and since 208604621 and 11528606 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (208604521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 104302310 + 104302311.

It is an arithmetic number, because the mean of its divisors is an integer number (104302311).

Almost surely, 2^208604621 is an apocalyptic number.

It is an amenable number.

208604621 is a deficient number, since it is larger than the sum of its proper divisors (1).

208604621 is an equidigital number, since it uses as much as digits as its factorization.

208604621 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4608, while the sum is 29.

The square root of 208604621 is about 14443.1513528039. The cubic root of 208604621 is about 593.0727568137.

The spelling of 208604621 in words is "two hundred eight million, six hundred four thousand, six hundred twenty-one".