211852681 has 2 divisors, whose sum is σ = 211852682. Its totient is φ = 211852680.

The previous prime is 211852661. The next prime is 211852723. The reversal of 211852681 is 186258112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 149695225 + 62157456 = 12235^2 + 7884^2 .

It is a cyclic number.

It is not a de Polignac number, because 211852681 - 2⁵ = 211852649 is a prime.

It is a super-2 number, since 2×211852681² = 89763116893775522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (211852601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105926340 + 105926341.

It is an arithmetic number, because the mean of its divisors is an integer number (105926341).

Almost surely, 2^211852681 is an apocalyptic number.

It is an amenable number.

211852681 is a deficient number, since it is larger than the sum of its proper divisors (1).

211852681 is an equidigital number, since it uses as much as digits as its factorization.

211852681 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7680, while the sum is 34.

The square root of 211852681 is about 14555.1599441573. The cubic root of 211852681 is about 596.1350468341.

The spelling of 211852681 in words is "two hundred eleven million, eight hundred fifty-two thousand, six hundred eighty-one".