290521081 has 2 divisors, whose sum is σ = 290521082. Its totient is φ = 290521080.

The previous prime is 290521069. The next prime is 290521139. The reversal of 290521081 is 180125092.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 189337600 + 101183481 = 13760^2 + 10059^2 .

It is a cyclic number.

It is not a de Polignac number, because 290521081 - 2¹³ = 290512889 is a prime.

It is a super-2 number, since 2×290521081² = 168804997010817122, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (290521031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 145260540 + 145260541.

It is an arithmetic number, because the mean of its divisors is an integer number (145260541).

Almost surely, 2^290521081 is an apocalyptic number.

It is an amenable number.

290521081 is a deficient number, since it is larger than the sum of its proper divisors (1).

290521081 is an equidigital number, since it uses as much as digits as its factorization.

290521081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1440, while the sum is 28.

The square root of 290521081 is about 17044.6789644158. The cubic root of 290521081 is about 662.3068047561.

The spelling of 290521081 in words is "two hundred ninety million, five hundred twenty-one thousand, eighty-one".