290890109 has 2 divisors, whose sum is σ = 290890110. Its totient is φ = 290890108.

The previous prime is 290890079. The next prime is 290890169. The reversal of 290890109 is 901098092.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 249545209 + 41344900 = 15797^2 + 6430^2 .

It is a cyclic number.

It is not a de Polignac number, because 290890109 - 2⁸ = 290889853 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (290890169) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 145445054 + 145445055.

It is an arithmetic number, because the mean of its divisors is an integer number (145445055).

Almost surely, 2^290890109 is an apocalyptic number.

It is an amenable number.

290890109 is a deficient number, since it is larger than the sum of its proper divisors (1).

290890109 is an equidigital number, since it uses as much as digits as its factorization.

290890109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11664, while the sum is 38.

The square root of 290890109 is about 17055.5008428366. The cubic root of 290890109 is about 662.5871129783.

The spelling of 290890109 in words is "two hundred ninety million, eight hundred ninety thousand, one hundred nine".