212289649846569 has 45 divisors (see below), whose sum is σ = 324679157576103. Its totient is φ = 138231449149248.

The previous prime is 212289649846559. The next prime is 212289649846577. The reversal of 212289649846569 is 965648946982212.

The square root of 212289649846569 is 14570163.

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

212289649846569 is a `hidden beast` number, since 2 + 1 + 2 + 2 + 8 + 9 + 6 + 4 + 9 + 8 + 46 + 569 = 666.

It can be written as a sum of positive squares in only one way, i.e., 203363657076969 + 8925992769600 = 14260563^2 + 2987640^2 .

It is a de Polignac number, because none of the positive numbers 2^k-212289649846569 is a prime.

It is a super-2 number, since 2×212289649846569² (a number of 29 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (81).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (212289649846559) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 44 ways as a sum of consecutive naturals, for example, 5638634257 + ... + 5638671905.

Almost surely, 2^{212289649846569} is an apocalyptic number.

212289649846569 is the 14570163-rd square number.

212289649846569 is the 7285082-nd centered octagonal number.

It is an amenable number.

212289649846569 is a deficient number, since it is larger than the sum of its proper divisors (112389507729534).

212289649846569 is an frugal number, since it uses more digits than its factorization.

212289649846569 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75396 (or 37695 counting only the distinct ones).

The product of its digits is 6449725440, while the sum is 81.

212289649846569 divided by its sum of digits (81) gives a square (2620859874649 = 1618907²).

The spelling of 212289649846569 in words is "two hundred twelve trillion, two hundred eighty-nine billion, six hundred forty-nine million, eight hundred forty-six thousand, five hundred sixty-nine".