290221097 has 4 divisors (see below), whose sum is σ = 290704596. Its totient is φ = 289737600.

The previous prime is 290221069. The next prime is 290221121. The reversal of 290221097 is 790122092.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 237745561 + 52475536 = 15419^2 + 7244^2 .

It is a cyclic number.

It is not a de Polignac number, because 290221097 - 2⁶ = 290221033 is a prime.

It is a super-3 number, since 3×290221097³ (a number of 26 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (290221027) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 240848 + ... + 242049.

It is an arithmetic number, because the mean of its divisors is an integer number (72676149).

Almost surely, 2^290221097 is an apocalyptic number.

It is an amenable number.

290221097 is a deficient number, since it is larger than the sum of its proper divisors (483499).

290221097 is an equidigital number, since it uses as much as digits as its factorization.

290221097 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 483498.

The product of its (nonzero) digits is 4536, while the sum is 32.

The square root of 290221097 is about 17035.8767605310. The cubic root of 290221097 is about 662.0787663783.

The spelling of 290221097 in words is "two hundred ninety million, two hundred twenty-one thousand, ninety-seven".