211097261 has 2 divisors, whose sum is σ = 211097262. Its totient is φ = 211097260.

The previous prime is 211097219. The next prime is 211097281. The reversal of 211097261 is 162790112.

211097261 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 121132036 + 89965225 = 11006^2 + 9485^2 .

It is a cyclic number.

It is not a de Polignac number, because 211097261 - 2¹⁸ = 210835117 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (211097281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105548630 + 105548631.

It is an arithmetic number, because the mean of its divisors is an integer number (105548631).

Almost surely, 2^211097261 is an apocalyptic number.

It is an amenable number.

211097261 is a deficient number, since it is larger than the sum of its proper divisors (1).

211097261 is an equidigital number, since it uses as much as digits as its factorization.

211097261 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1512, while the sum is 29.

The square root of 211097261 is about 14529.1865223074. The cubic root of 211097261 is about 595.4256408767.

The spelling of 211097261 in words is "two hundred eleven million, ninety-seven thousand, two hundred sixty-one".