90820291 has 2 divisors, whose sum is σ = 90820292. Its totient is φ = 90820290.

The previous prime is 90820259. The next prime is 90820319. The reversal of 90820291 is 19202809.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 90820291 - 2⁵ = 90820259 is a prime.

It is not a weakly prime, because it can be changed into another prime (90820201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45410145 + 45410146.

It is an arithmetic number, because the mean of its divisors is an integer number (45410146).

Almost surely, 2^90820291 is an apocalyptic number.

90820291 is a deficient number, since it is larger than the sum of its proper divisors (1).

90820291 is an equidigital number, since it uses as much as digits as its factorization.

90820291 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2592, while the sum is 31.

The square root of 90820291 is about 9529.9680482151. The cubic root of 90820291 is about 449.4978612892.

The spelling of 90820291 in words is "ninety million, eight hundred twenty thousand, two hundred ninety-one".