208222649 has 2 divisors, whose sum is σ = 208222650. Its totient is φ = 208222648.

The previous prime is 208222603. The next prime is 208222669. The reversal of 208222649 is 946222802.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 198612649 + 9610000 = 14093^2 + 3100^2 .

It is a cyclic number.

It is not a de Polignac number, because 208222649 - 2¹² = 208218553 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (208222669) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 104111324 + 104111325.

It is an arithmetic number, because the mean of its divisors is an integer number (104111325).

Almost surely, 2^208222649 is an apocalyptic number.

It is an amenable number.

208222649 is a deficient number, since it is larger than the sum of its proper divisors (1).

208222649 is an equidigital number, since it uses as much as digits as its factorization.

208222649 is an odious number, because the sum of its binary digits is odd.

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

The square root of 208222649 is about 14429.9220025612. The cubic root of 208222649 is about 592.7105475202.

The spelling of 208222649 in words is "two hundred eight million, two hundred twenty-two thousand, six hundred forty-nine".