290330921 has 2 divisors, whose sum is σ = 290330922. Its totient is φ = 290330920.

The previous prime is 290330869. The next prime is 290330927. The reversal of 290330921 is 129033092.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 290225296 + 105625 = 17036^2 + 325^2 .

It is a cyclic number.

It is not a de Polignac number, because 290330921 - 2¹⁴ = 290314537 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (290330927) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 145165460 + 145165461.

It is an arithmetic number, because the mean of its divisors is an integer number (145165461).

Almost surely, 2^290330921 is an apocalyptic number.

It is an amenable number.

290330921 is a deficient number, since it is larger than the sum of its proper divisors (1).

290330921 is an equidigital number, since it uses as much as digits as its factorization.

290330921 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2916, while the sum is 29.

The square root of 290330921 is about 17039.0997708212. The cubic root of 290330921 is about 662.1622693459.

The spelling of 290330921 in words is "two hundred ninety million, three hundred thirty thousand, nine hundred twenty-one".