290666989 has 2 divisors, whose sum is σ = 290666990. Its totient is φ = 290666988.

The previous prime is 290666963. The next prime is 290666993. The reversal of 290666989 is 989666092.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 245548900 + 45118089 = 15670^2 + 6717^2 .

It is a cyclic number.

It is not a de Polignac number, because 290666989 - 2⁹ = 290666477 is a prime.

It is a super-2 number, since 2×290666989² = 168974596988652242, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (290666489) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 145333494 + 145333495.

It is an arithmetic number, because the mean of its divisors is an integer number (145333495).

Almost surely, 2^290666989 is an apocalyptic number.

It is an amenable number.

290666989 is a deficient number, since it is larger than the sum of its proper divisors (1).

290666989 is an equidigital number, since it uses as much as digits as its factorization.

290666989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2519424, while the sum is 55.

The square root of 290666989 is about 17048.9585898963. The cubic root of 290666989 is about 662.4176626758.

The spelling of 290666989 in words is "two hundred ninety million, six hundred sixty-six thousand, nine hundred eighty-nine".