290666813 has 2 divisors, whose sum is σ = 290666814. Its totient is φ = 290666812.

The previous prime is 290666773. The next prime is 290666821. The reversal of 290666813 is 318666092.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 283686649 + 6980164 = 16843^2 + 2642^2 .

It is a cyclic number.

It is not a de Polignac number, because 290666813 - 2⁶ = 290666749 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (290666843) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 145333406 + 145333407.

It is an arithmetic number, because the mean of its divisors is an integer number (145333407).

Almost surely, 2^290666813 is an apocalyptic number.

It is an amenable number.

290666813 is a deficient number, since it is larger than the sum of its proper divisors (1).

290666813 is an equidigital number, since it uses as much as digits as its factorization.

290666813 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 93312, while the sum is 41.

The square root of 290666813 is about 17048.9534282900. The cubic root of 290666813 is about 662.4175289770.

The spelling of 290666813 in words is "two hundred ninety million, six hundred sixty-six thousand, eight hundred thirteen".