211285331 has 2 divisors, whose sum is σ = 211285332. Its totient is φ = 211285330.

The previous prime is 211285309. The next prime is 211285343. The reversal of 211285331 is 133582112.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-211285331 is a prime.

It is a super-2 number, since 2×211285331² = 89282982191559122, which contains 22 as substring.

It is a Sophie Germain prime.

It is a self number, because there is not a number n which added to its sum of digits gives 211285331.

It is not a weakly prime, because it can be changed into another prime (211285631) 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, 105642665 + 105642666.

It is an arithmetic number, because the mean of its divisors is an integer number (105642666).

Almost surely, 2^211285331 is an apocalyptic number.

211285331 is a deficient number, since it is larger than the sum of its proper divisors (1).

211285331 is an equidigital number, since it uses as much as digits as its factorization.

211285331 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1440, while the sum is 26.

The square root of 211285331 is about 14535.6572262832. The cubic root of 211285331 is about 595.6024132024.

The spelling of 211285331 in words is "two hundred eleven million, two hundred eighty-five thousand, three hundred thirty-one".