290269981 has 2 divisors, whose sum is σ = 290269982. Its totient is φ = 290269980.

The previous prime is 290269963. The next prime is 290270021. The reversal of 290269981 is 189962092.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 268796025 + 21473956 = 16395^2 + 4634^2 .

It is a cyclic number.

It is not a de Polignac number, because 290269981 - 2⁵ = 290269949 is a prime.

It is a super-2 number, since 2×290269981² = 168513323739480722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (290269081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 145134990 + 145134991.

It is an arithmetic number, because the mean of its divisors is an integer number (145134991).

Almost surely, 2^290269981 is an apocalyptic number.

It is an amenable number.

290269981 is a deficient number, since it is larger than the sum of its proper divisors (1).

290269981 is an equidigital number, since it uses as much as digits as its factorization.

290269981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 139968, while the sum is 46.

The square root of 290269981 is about 17037.3114369609. The cubic root of 290269981 is about 662.1159371672.

The spelling of 290269981 in words is "two hundred ninety million, two hundred sixty-nine thousand, nine hundred eighty-one".