120531161 has 4 divisors (see below), whose sum is σ = 120636852. Its totient is φ = 120425472.

The previous prime is 120531157. The next prime is 120531167. The reversal of 120531161 is 161135021.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 161135021 = 7243 ⋅22247.

It can be written as a sum of positive squares in 2 ways, for example, as 36240400 + 84290761 = 6020^2 + 9181^2 .

It is a cyclic number.

It is not a de Polignac number, because 120531161 - 2² = 120531157 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (120531167) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 51116 + ... + 53421.

It is an arithmetic number, because the mean of its divisors is an integer number (30159213).

Almost surely, 2^120531161 is an apocalyptic number.

It is an amenable number.

120531161 is a deficient number, since it is larger than the sum of its proper divisors (105691).

120531161 is a wasteful number, since it uses less digits than its factorization.

120531161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105690.

The product of its (nonzero) digits is 180, while the sum is 20.

The square root of 120531161 is about 10978.6684529591. The cubic root of 120531161 is about 493.9690968883.

Adding to 120531161 its reverse (161135021), we get a palindrome (281666182).

The spelling of 120531161 in words is "one hundred twenty million, five hundred thirty-one thousand, one hundred sixty-one".