290990971 has 2 divisors, whose sum is σ = 290990972. Its totient is φ = 290990970.

The previous prime is 290990951. The next prime is 290991007. The reversal of 290990971 is 179099092.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 290990971 - 2⁵ = 290990939 is a prime.

It is not a weakly prime, because it can be changed into another prime (290990911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 145495485 + 145495486.

It is an arithmetic number, because the mean of its divisors is an integer number (145495486).

Almost surely, 2^290990971 is an apocalyptic number.

290990971 is a deficient number, since it is larger than the sum of its proper divisors (1).

290990971 is an equidigital number, since it uses as much as digits as its factorization.

290990971 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 91854, while the sum is 46.

The square root of 290990971 is about 17058.4574625023. The cubic root of 290990971 is about 662.6636850086.

The spelling of 290990971 in words is "two hundred ninety million, nine hundred ninety thousand, nine hundred seventy-one".