211761449 has 2 divisors, whose sum is σ = 211761450. Its totient is φ = 211761448.

The previous prime is 211761419. The next prime is 211761457. The reversal of 211761449 is 944167112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 207216025 + 4545424 = 14395^2 + 2132^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-211761449 is a prime.

It is a super-2 number, since 2×211761449² = 89685822565159202, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (211761419) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105880724 + 105880725.

It is an arithmetic number, because the mean of its divisors is an integer number (105880725).

Almost surely, 2^211761449 is an apocalyptic number.

It is an amenable number.

211761449 is a deficient number, since it is larger than the sum of its proper divisors (1).

211761449 is an equidigital number, since it uses as much as digits as its factorization.

211761449 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12096, while the sum is 35.

The square root of 211761449 is about 14552.0255978335. The cubic root of 211761449 is about 596.0494615723.

The spelling of 211761449 in words is "two hundred eleven million, seven hundred sixty-one thousand, four hundred forty-nine".