120564581 has 4 divisors (see below), whose sum is σ = 120716652. Its totient is φ = 120412512.

The previous prime is 120564547. The next prime is 120564583. The reversal of 120564581 is 185465021.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 185465021 = 7 ⋅26495003.

It can be written as a sum of positive squares in 2 ways, for example, as 95863681 + 24700900 = 9791^2 + 4970^2 .

It is a cyclic number.

It is not a de Polignac number, because 120564581 - 2¹⁸ = 120302437 is a prime.

It is a super-2 number, since 2×120564581² = 29071636383411122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (120564583) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 74840 + ... + 76433.

It is an arithmetic number, because the mean of its divisors is an integer number (30179163).

Almost surely, 2^120564581 is an apocalyptic number.

It is an amenable number.

120564581 is a deficient number, since it is larger than the sum of its proper divisors (152071).

120564581 is an equidigital number, since it uses as much as digits as its factorization.

120564581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 152070.

The product of its (nonzero) digits is 9600, while the sum is 32.

The square root of 120564581 is about 10980.1903899705. The cubic root of 120564581 is about 494.0147473838.

The spelling of 120564581 in words is "one hundred twenty million, five hundred sixty-four thousand, five hundred eighty-one".