211001081 has 2 divisors, whose sum is σ = 211001082. Its totient is φ = 211001080.

The previous prime is 211001053. The next prime is 211001101. The reversal of 211001081 is 180100112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 210511081 + 490000 = 14509^2 + 700^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-211001081 is a prime.

It is a super-2 number, since 2×211001081² = 89042912366337122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (211001281) 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, 105500540 + 105500541.

It is an arithmetic number, because the mean of its divisors is an integer number (105500541).

Almost surely, 2^211001081 is an apocalyptic number.

It is an amenable number.

211001081 is a deficient number, since it is larger than the sum of its proper divisors (1).

211001081 is an equidigital number, since it uses as much as digits as its factorization.

211001081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16, while the sum is 14.

The square root of 211001081 is about 14525.8762558408. The cubic root of 211001081 is about 595.3351979887.

Adding to 211001081 its reverse (180100112), we get a palindrome (391101193).

The spelling of 211001081 in words is "two hundred eleven million, one thousand, eighty-one".