120331561 has 8 divisors (see below), whose sum is σ = 143501184. Its totient is φ = 98656800.

The previous prime is 120331543. The next prime is 120331567. The reversal of 120331561 is 165133021.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 120331561 - 2⁵ = 120331529 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (120331567) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 373540 + ... + 373861.

It is an arithmetic number, because the mean of its divisors is an integer number (17937648).

Almost surely, 2^120331561 is an apocalyptic number.

It is an amenable number.

120331561 is a deficient number, since it is larger than the sum of its proper divisors (23169623).

120331561 is an equidigital number, since it uses as much as digits as its factorization.

120331561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 747431.

The product of its (nonzero) digits is 540, while the sum is 22.

The square root of 120331561 is about 10969.5743308480. The cubic root of 120331561 is about 493.6962747504.

Adding to 120331561 its reverse (165133021), we get a palindrome (285464582).

The spelling of 120331561 in words is "one hundred twenty million, three hundred thirty-one thousand, five hundred sixty-one".