211013261 has 2 divisors, whose sum is σ = 211013262. Its totient is φ = 211013260.

The previous prime is 211013237. The next prime is 211013267. The reversal of 211013261 is 162310112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 210975625 + 37636 = 14525^2 + 194^2 .

It is a cyclic number.

It is not a de Polignac number, because 211013261 - 2¹⁸ = 210751117 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (211013267) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105506630 + 105506631.

It is an arithmetic number, because the mean of its divisors is an integer number (105506631).

Almost surely, 2^211013261 is an apocalyptic number.

It is an amenable number.

211013261 is a deficient number, since it is larger than the sum of its proper divisors (1).

211013261 is an equidigital number, since it uses as much as digits as its factorization.

211013261 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72, while the sum is 17.

The square root of 211013261 is about 14526.2955016067. The cubic root of 211013261 is about 595.3466529746.

Adding to 211013261 its reverse (162310112), we get a palindrome (373323373).

The spelling of 211013261 in words is "two hundred eleven million, thirteen thousand, two hundred sixty-one".