290198221 has 8 divisors (see below), whose sum is σ = 293330840. Its totient is φ = 287074368.

The previous prime is 290198203. The next prime is 290198261. The reversal of 290198221 is 122891092.

It can be written as a sum of positive squares in 4 ways, for example, as 162282121 + 127916100 = 12739^2 + 11310^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 290198221 - 2⁷ = 290198093 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (290198261) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 80755 + ... + 84271.

It is an arithmetic number, because the mean of its divisors is an integer number (36666355).

Almost surely, 2^290198221 is an apocalyptic number.

It is an amenable number.

290198221 is a deficient number, since it is larger than the sum of its proper divisors (3132619).

290198221 is a wasteful number, since it uses less digits than its factorization.

290198221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4383.

The product of its (nonzero) digits is 5184, while the sum is 34.

The square root of 290198221 is about 17035.2053407055. The cubic root of 290198221 is about 662.0613703172.

The spelling of 290198221 in words is "two hundred ninety million, one hundred ninety-eight thousand, two hundred twenty-one".