491112122121 has 6 divisors (see below), whose sum is σ = 709384176410. Its totient is φ = 327408081408.

The previous prime is 491112122099. The next prime is 491112122129. The reversal of 491112122121 is 121221211194.

491112122121 is a `hidden beast` number, since 491 + 11 + 21 + 22 + 121 = 666.

It can be written as a sum of positive squares in only one way, i.e., 435849515721 + 55262606400 = 660189^2 + 235080^2 .

It is not a de Polignac number, because 491112122121 - 2²⁹ = 490575251209 is a prime.

It is a super-2 number, since 2×491112122121² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (491112122129) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 27284006776 + ... + 27284006793.

Almost surely, 2^491112122121 is an apocalyptic number.

It is an amenable number.

491112122121 is a deficient number, since it is larger than the sum of its proper divisors (218272054289).

491112122121 is a wasteful number, since it uses less digits than its factorization.

491112122121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54568013575 (or 54568013572 counting only the distinct ones).

The product of its digits is 576, while the sum is 27.

The spelling of 491112122121 in words is "four hundred ninety-one billion, one hundred twelve million, one hundred twenty-two thousand, one hundred twenty-one".