120172284161 has 6 divisors (see below), whose sum is σ = 123105589362. Its totient is φ = 117239087280.

The previous prime is 120172284157. The next prime is 120172284191. The reversal of 120172284161 is 161482271021.

It can be written as a sum of positive squares in only one way, i.e., 73275783025 + 46896501136 = 270695^2 + 216556^2 .

It is not a de Polignac number, because 120172284161 - 2² = 120172284157 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (120172284191) 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 5 ways as a sum of consecutive naturals, for example, 2192630 + ... + 2246768.

It is an arithmetic number, because the mean of its divisors is an integer number (20517598227).

Almost surely, 2^120172284161 is an apocalyptic number.

It is an amenable number.

120172284161 is a deficient number, since it is larger than the sum of its proper divisors (2933305201).

120172284161 is an frugal number, since it uses more digits than its factorization.

120172284161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 108319 (or 54180 counting only the distinct ones).

The product of its (nonzero) digits is 10752, while the sum is 35.

The spelling of 120172284161 in words is "one hundred twenty billion, one hundred seventy-two million, two hundred eighty-four thousand, one hundred sixty-one".