647211123 has 12 divisors (see below), whose sum is σ = 1006773040. Its totient is φ = 398283696.

The previous prime is 647211121. The next prime is 647211127. The reversal of 647211123 is 321112746.

647211123 is a `hidden beast` number, since 647 + 2 + 1 + 1 + 12 + 3 = 666.

647211123 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 647211123 - 2¹ = 647211121 is a prime.

It is a super-2 number, since 2×647211123² = 837764475469842258, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (647211121) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2765743 + ... + 2765976.

Almost surely, 2^647211123 is an apocalyptic number.

647211123 is a deficient number, since it is larger than the sum of its proper divisors (359561917).

647211123 is a wasteful number, since it uses less digits than its factorization.

647211123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5531738 (or 5531735 counting only the distinct ones).

The product of its digits is 2016, while the sum is 27.

The square root of 647211123 is about 25440.3443962538. The cubic root of 647211123 is about 864.9984398604.

Adding to 647211123 its reverse (321112746), we get a palindrome (968323869).

The spelling of 647211123 in words is "six hundred forty-seven million, two hundred eleven thousand, one hundred twenty-three".