291101 has 2 divisors, whose sum is σ = 291102. Its totient is φ = 291100.

The previous prime is 291089. The next prime is 291103. The reversal of 291101 is 101192.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 280900 + 10201 = 530^2 + 101^2 .

It is a cyclic number.

It is not a de Polignac number, because 291101 - 2⁶ = 291037 is a prime.

It is a Sophie Germain prime.

Together with 291103, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (291103) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 145550 + 145551.

It is an arithmetic number, because the mean of its divisors is an integer number (145551).

2²⁹¹¹⁰¹ is an apocalyptic number.

It is an amenable number.

291101 is a deficient number, since it is larger than the sum of its proper divisors (1).

291101 is an equidigital number, since it uses as much as digits as its factorization.

291101 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18, while the sum is 14.

The square root of 291101 is about 539.5377651286. The cubic root of 291101 is about 66.2747196231.

Adding to 291101 its reverse (101192), we get a palindrome (392293).

The spelling of 291101 in words is "two hundred ninety-one thousand, one hundred one".