290945989 has 2 divisors, whose sum is σ = 290945990. Its totient is φ = 290945988.

The previous prime is 290945969. The next prime is 290946011. The reversal of 290945989 is 989549092.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 219543489 + 71402500 = 14817^2 + 8450^2 .

It is a cyclic number.

It is not a de Polignac number, because 290945989 - 2⁵ = 290945957 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (290945909) 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, 145472994 + 145472995.

It is an arithmetic number, because the mean of its divisors is an integer number (145472995).

Almost surely, 2^290945989 is an apocalyptic number.

It is an amenable number.

290945989 is a deficient number, since it is larger than the sum of its proper divisors (1).

290945989 is an equidigital number, since it uses as much as digits as its factorization.

290945989 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2099520, while the sum is 55.

The square root of 290945989 is about 17057.1389453214. The cubic root of 290945989 is about 662.6295379309.

The spelling of 290945989 in words is "two hundred ninety million, nine hundred forty-five thousand, nine hundred eighty-nine".