208458121 has 2 divisors, whose sum is σ = 208458122. Its totient is φ = 208458120.

The previous prime is 208458077. The next prime is 208458127. The reversal of 208458121 is 121854802.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 208398096 + 60025 = 14436^2 + 245^2 .

It is a cyclic number.

It is not a de Polignac number, because 208458121 - 2¹⁵ = 208425353 is a prime.

It is not a weakly prime, because it can be changed into another prime (208458127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 104229060 + 104229061.

It is an arithmetic number, because the mean of its divisors is an integer number (104229061).

Almost surely, 2^208458121 is an apocalyptic number.

It is an amenable number.

208458121 is a deficient number, since it is larger than the sum of its proper divisors (1).

208458121 is an equidigital number, since it uses as much as digits as its factorization.

208458121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5120, while the sum is 31.

The square root of 208458121 is about 14438.0788541966. The cubic root of 208458121 is about 592.9338888350.

It can be divided in two parts, 208 and 458121, that added together give a square (458329 = 677²).

The spelling of 208458121 in words is "two hundred eight million, four hundred fifty-eight thousand, one hundred twenty-one".