290030921 has 2 divisors, whose sum is σ = 290030922. Its totient is φ = 290030920.

The previous prime is 290030879. The next prime is 290030927. The reversal of 290030921 is 129030092.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 149940025 + 140090896 = 12245^2 + 11836^2 .

It is a cyclic number.

It is not a de Polignac number, because 290030921 - 2⁶ = 290030857 is a prime.

It is a super-2 number, since 2×290030921² = 168235870272216482, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (290030927) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 145015460 + 145015461.

It is an arithmetic number, because the mean of its divisors is an integer number (145015461).

Almost surely, 2^290030921 is an apocalyptic number.

It is an amenable number.

290030921 is a deficient number, since it is larger than the sum of its proper divisors (1).

290030921 is an equidigital number, since it uses as much as digits as its factorization.

290030921 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 972, while the sum is 26.

The square root of 290030921 is about 17030.2942135478. The cubic root of 290030921 is about 661.9341191821.

The spelling of 290030921 in words is "two hundred ninety million, thirty thousand, nine hundred twenty-one".