290327981 has 2 divisors, whose sum is σ = 290327982. Its totient is φ = 290327980.

The previous prime is 290327963. The next prime is 290328007. The reversal of 290327981 is 189723092.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 260176900 + 30151081 = 16130^2 + 5491^2 .

It is a cyclic number.

It is not a de Polignac number, because 290327981 - 2¹⁴ = 290311597 is a prime.

It is a super-2 number, since 2×290327981² = 168580673103072722, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (290327881) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 145163990 + 145163991.

It is an arithmetic number, because the mean of its divisors is an integer number (145163991).

Almost surely, 2^290327981 is an apocalyptic number.

It is an amenable number.

290327981 is a deficient number, since it is larger than the sum of its proper divisors (1).

290327981 is an equidigital number, since it uses as much as digits as its factorization.

290327981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 54432, while the sum is 41.

The square root of 290327981 is about 17039.0134984394. The cubic root of 290327981 is about 662.1600342370.

The spelling of 290327981 in words is "two hundred ninety million, three hundred twenty-seven thousand, nine hundred eighty-one".