208649293 has 2 divisors, whose sum is σ = 208649294. Its totient is φ = 208649292.

The previous prime is 208649269. The next prime is 208649297. The reversal of 208649293 is 392946802.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 119290084 + 89359209 = 10922^2 + 9453^2 .

It is a cyclic number.

It is not a de Polignac number, because 208649293 - 2¹⁷ = 208518221 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (208649297) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 104324646 + 104324647.

It is an arithmetic number, because the mean of its divisors is an integer number (104324647).

Almost surely, 2^208649293 is an apocalyptic number.

It is an amenable number.

208649293 is a deficient number, since it is larger than the sum of its proper divisors (1).

208649293 is an equidigital number, since it uses as much as digits as its factorization.

208649293 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 186624, while the sum is 43.

The square root of 208649293 is about 14444.6977469243. The cubic root of 208649293 is about 593.1150886584.

The spelling of 208649293 in words is "two hundred eight million, six hundred forty-nine thousand, two hundred ninety-three".