120559681 has 6 divisors (see below), whose sum is σ = 132516146. Its totient is φ = 109599600.

The previous prime is 120559669. The next prime is 120559687. The reversal of 120559681 is 186955021.

It can be written as a sum of positive squares in only one way, i.e., 104878081 + 15681600 = 10241^2 + 3960^2 .

It is not a de Polignac number, because 120559681 - 2⁷ = 120559553 is a prime.

It is a super-2 number, since 2×120559681² = 29069273365643522, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 120559681.

It is not an unprimeable number, because it can be changed into a prime (120559687) 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 5 ways as a sum of consecutive naturals, for example, 498060 + ... + 498301.

Almost surely, 2^120559681 is an apocalyptic number.

120559681 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

120559681 is a deficient number, since it is larger than the sum of its proper divisors (11956465).

120559681 is an equidigital number, since it uses as much as digits as its factorization.

120559681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 996383 (or 996372 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 37.

The square root of 120559681 is about 10979.9672586033. The cubic root of 120559681 is about 494.0080546912.

It can be divided in two parts, 12055 and 9681, that added together give a triangular number (21736 = T₂₀₈).

The spelling of 120559681 in words is "one hundred twenty million, five hundred fifty-nine thousand, six hundred eighty-one".