120718561 has 4 divisors (see below), whose sum is σ = 124881300. Its totient is φ = 116555824.

The previous prime is 120718553. The next prime is 120718583. The reversal of 120718561 is 165817021.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 27499536 + 93219025 = 5244^2 + 9655^2 .

It is a cyclic number.

It is not a de Polignac number, because 120718561 - 2³ = 120718553 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (120718511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2081326 + ... + 2081383.

It is an arithmetic number, because the mean of its divisors is an integer number (31220325).

Almost surely, 2^120718561 is an apocalyptic number.

It is an amenable number.

120718561 is a deficient number, since it is larger than the sum of its proper divisors (4162739).

120718561 is an equidigital number, since it uses as much as digits as its factorization.

120718561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4162738.

The product of its (nonzero) digits is 3360, while the sum is 31.

The square root of 120718561 is about 10987.1998707587. The cubic root of 120718561 is about 494.2249695164.

The spelling of 120718561 in words is "one hundred twenty million, seven hundred eighteen thousand, five hundred sixty-one".