211131091 has 2 divisors, whose sum is σ = 211131092. Its totient is φ = 211131090.

The previous prime is 211131083. The next prime is 211131101. The reversal of 211131091 is 190131112.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 211131091 - 2³ = 211131083 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (211131061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105565545 + 105565546.

It is an arithmetic number, because the mean of its divisors is an integer number (105565546).

Almost surely, 2^211131091 is an apocalyptic number.

211131091 is a deficient number, since it is larger than the sum of its proper divisors (1).

211131091 is an equidigital number, since it uses as much as digits as its factorization.

211131091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 54, while the sum is 19.

The square root of 211131091 is about 14530.3506839993. The cubic root of 211131091 is about 595.4574463952.

The spelling of 211131091 in words is "two hundred eleven million, one hundred thirty-one thousand, ninety-one".