211939527608449 has 3 divisors (see below), whose sum is σ = 211939542166593. Its totient is φ = 211939513050306.

The previous prime is 211939527608407. The next prime is 211939527608579. The reversal of 211939527608449 is 944806725939112.

The square root of 211939527608449 is 14558143.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a de Polignac number, because none of the positive numbers 2^k-211939527608449 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (211939527408449) 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 in 2 ways as a sum of consecutive naturals, for example, 7279072 + ... + 21837214.

It is an arithmetic number, because the mean of its divisors is an integer number (70646514055531).

It is a 2-persistent number, because it is pandigital, and so is 2⋅211939527608449 = 423879055216898, but 3⋅211939527608449 = 635818582825347 is not.

Almost surely, 2^{211939527608449} is an apocalyptic number.

211939527608449 is the 14558143-rd square number.

211939527608449 is the 7279072-nd centered octagonal number.

It is an amenable number.

211939527608449 is a deficient number, since it is larger than the sum of its proper divisors (14558144).

211939527608449 is an frugal number, since it uses more digits than its factorization.

211939527608449 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29116286 (or 14558143 counting only the distinct ones).

The product of its (nonzero) digits is 235146240, while the sum is 70.

The spelling of 211939527608449 in words is "two hundred eleven trillion, nine hundred thirty-nine billion, five hundred twenty-seven million, six hundred eight thousand, four hundred forty-nine".