99890291 has 2 divisors, whose sum is σ = 99890292. Its totient is φ = 99890290.

The previous prime is 99890281. The next prime is 99890299. The reversal of 99890291 is 19209899.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 99890291 - 2¹⁸ = 99628147 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (99890299) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49945145 + 49945146.

It is an arithmetic number, because the mean of its divisors is an integer number (49945146).

Almost surely, 2^99890291 is an apocalyptic number.

99890291 is a deficient number, since it is larger than the sum of its proper divisors (1).

99890291 is an equidigital number, since it uses as much as digits as its factorization.

99890291 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 104976, while the sum is 47.

The square root of 99890291 is about 9994.5130446661. The cubic root of 99890291 is about 463.9890798931.

The spelling of 99890291 in words is "ninety-nine million, eight hundred ninety thousand, two hundred ninety-one".