211342591 has 2 divisors, whose sum is σ = 211342592. Its totient is φ = 211342590.

The previous prime is 211342559. The next prime is 211342609. The reversal of 211342591 is 195243112.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 211342591 - 2⁵ = 211342559 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (211342541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105671295 + 105671296.

It is an arithmetic number, because the mean of its divisors is an integer number (105671296).

Almost surely, 2^211342591 is an apocalyptic number.

211342591 is a deficient number, since it is larger than the sum of its proper divisors (1).

211342591 is an equidigital number, since it uses as much as digits as its factorization.

211342591 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2160, while the sum is 28.

The square root of 211342591 is about 14537.6267320357. The cubic root of 211342591 is about 595.6562126682.

The spelling of 211342591 in words is "two hundred eleven million, three hundred forty-two thousand, five hundred ninety-one".