211372981 has 2 divisors, whose sum is σ = 211372982. Its totient is φ = 211372980.

The previous prime is 211372979. The next prime is 211373009. The reversal of 211372981 is 189273112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 162792081 + 48580900 = 12759^2 + 6970^2 .

It is a cyclic number.

It is not a de Polignac number, because 211372981 - 2¹ = 211372979 is a prime.

It is a super-2 number, since 2×211372981² = 89357074193652722, which contains 22 as substring.

Together with 211372979, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (211372961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105686490 + 105686491.

It is an arithmetic number, because the mean of its divisors is an integer number (105686491).

Almost surely, 2^211372981 is an apocalyptic number.

It is an amenable number.

211372981 is a deficient number, since it is larger than the sum of its proper divisors (1).

211372981 is an equidigital number, since it uses as much as digits as its factorization.

211372981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6048, while the sum is 34.

The square root of 211372981 is about 14538.6719132113. The cubic root of 211372981 is about 595.6847620874.

The spelling of 211372981 in words is "two hundred eleven million, three hundred seventy-two thousand, nine hundred eighty-one".