120356561 has 6 divisors (see below), whose sum is σ = 130327110. Its totient is φ = 111098208.

The previous prime is 120356543. The next prime is 120356563. The reversal of 120356561 is 165653021.

It can be written as a sum of positive squares in 3 ways, for example, as 15171025 + 105185536 = 3895^2 + 10256^2 .

It is not a de Polignac number, because 120356561 - 2²⁶ = 53247697 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (120356563) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 355916 + ... + 356253.

It is an arithmetic number, because the mean of its divisors is an integer number (21721185).

Almost surely, 2^120356561 is an apocalyptic number.

It is an amenable number.

120356561 is a deficient number, since it is larger than the sum of its proper divisors (9970549).

120356561 is an equidigital number, since it uses as much as digits as its factorization.

120356561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 712195 (or 712182 counting only the distinct ones).

The product of its (nonzero) digits is 5400, while the sum is 29.

The square root of 120356561 is about 10970.7137871699. The cubic root of 120356561 is about 493.7304623792.

The spelling of 120356561 in words is "one hundred twenty million, three hundred fifty-six thousand, five hundred sixty-one".