211622449 has 2 divisors, whose sum is σ = 211622450. Its totient is φ = 211622448.

The previous prime is 211622419. The next prime is 211622491. The reversal of 211622449 is 944226112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 206640625 + 4981824 = 14375^2 + 2232^2 .

It is a cyclic number.

It is not a de Polignac number, because 211622449 - 2⁵ = 211622417 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 211622449.

It is not a weakly prime, because it can be changed into another prime (211622419) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105811224 + 105811225.

It is an arithmetic number, because the mean of its divisors is an integer number (105811225).

Almost surely, 2^211622449 is an apocalyptic number.

It is an amenable number.

211622449 is a deficient number, since it is larger than the sum of its proper divisors (1).

211622449 is an equidigital number, since it uses as much as digits as its factorization.

211622449 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6912, while the sum is 31.

The square root of 211622449 is about 14547.2488464314. The cubic root of 211622449 is about 595.9190176067.

The spelling of 211622449 in words is "two hundred eleven million, six hundred twenty-two thousand, four hundred forty-nine".