211617661231 has 2 divisors, whose sum is σ = 211617661232. Its totient is φ = 211617661230.

The previous prime is 211617661193. The next prime is 211617661247. The reversal of 211617661231 is 132166716112.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 211617661231 - 2¹⁵ = 211617628463 is a prime.

It is a super-2 number, since 2×211617661231² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (211617661261) 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, 105808830615 + 105808830616.

It is an arithmetic number, because the mean of its divisors is an integer number (105808830616).

Almost surely, 2^211617661231 is an apocalyptic number.

211617661231 is a deficient number, since it is larger than the sum of its proper divisors (1).

211617661231 is an equidigital number, since it uses as much as digits as its factorization.

211617661231 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 18144, while the sum is 37.

The spelling of 211617661231 in words is "two hundred eleven billion, six hundred seventeen million, six hundred sixty-one thousand, two hundred thirty-one".