118304561 has 4 divisors (see below), whose sum is σ = 118917732. Its totient is φ = 117691392.

The previous prime is 118304551. The next prime is 118304573. The reversal of 118304561 is 165403811.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 165403811 = 83 ⋅1992817.

It can be written as a sum of positive squares in 2 ways, for example, as 61528336 + 56776225 = 7844^2 + 7535^2 .

It is a cyclic number.

It is not a de Polignac number, because 118304561 - 2⁶ = 118304497 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (118304521) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 306296 + ... + 306681.

It is an arithmetic number, because the mean of its divisors is an integer number (29729433).

Almost surely, 2^118304561 is an apocalyptic number.

It is an amenable number.

118304561 is a deficient number, since it is larger than the sum of its proper divisors (613171).

118304561 is an equidigital number, since it uses as much as digits as its factorization.

118304561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 613170.

The product of its (nonzero) digits is 2880, while the sum is 29.

The square root of 118304561 is about 10876.7900136024. The cubic root of 118304561 is about 490.9084369312.

The spelling of 118304561 in words is "one hundred eighteen million, three hundred four thousand, five hundred sixty-one".