290920109 has 2 divisors, whose sum is σ = 290920110. Its totient is φ = 290920108.

The previous prime is 290920067. The next prime is 290920117. The reversal of 290920109 is 901029092.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 199430884 + 91489225 = 14122^2 + 9565^2 .

It is a cyclic number.

It is not a de Polignac number, because 290920109 - 2¹² = 290916013 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (290920009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 145460054 + 145460055.

It is an arithmetic number, because the mean of its divisors is an integer number (145460055).

Almost surely, 2^290920109 is an apocalyptic number.

It is an amenable number.

290920109 is a deficient number, since it is larger than the sum of its proper divisors (1).

290920109 is an equidigital number, since it uses as much as digits as its factorization.

290920109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2916, while the sum is 32.

The square root of 290920109 is about 17056.3803018108. The cubic root of 290920109 is about 662.6098901135.

The spelling of 290920109 in words is "two hundred ninety million, nine hundred twenty thousand, one hundred nine".