211414661 has 2 divisors, whose sum is σ = 211414662. Its totient is φ = 211414660.

The previous prime is 211414649. The next prime is 211414673. The reversal of 211414661 is 166414112.

It is a balanced prime because it is at equal distance from previous prime (211414649) and next prime (211414673).

It can be written as a sum of positive squares in only one way, i.e., 125574436 + 85840225 = 11206^2 + 9265^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-211414661 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 211414661.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (211414631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105707330 + 105707331.

It is an arithmetic number, because the mean of its divisors is an integer number (105707331).

Almost surely, 2^211414661 is an apocalyptic number.

It is an amenable number.

211414661 is a deficient number, since it is larger than the sum of its proper divisors (1).

211414661 is an equidigital number, since it uses as much as digits as its factorization.

211414661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1152, while the sum is 26.

The square root of 211414661 is about 14540.1052609670. The cubic root of 211414661 is about 595.7239132741.

Adding to 211414661 its reverse (166414112), we get a palindrome (377828773).

The spelling of 211414661 in words is "two hundred eleven million, four hundred fourteen thousand, six hundred sixty-one".