118535561 has 4 divisors (see below), whose sum is σ = 118582800. Its totient is φ = 118488324.

The previous prime is 118535539. The next prime is 118535569. The reversal of 118535561 is 165535811.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 165535811 = 7 ⋅23647973.

It is a cyclic number.

It is not a de Polignac number, because 118535561 - 2¹⁸ = 118273417 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (118535569) 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, 19631 + ... + 24948.

It is an arithmetic number, because the mean of its divisors is an integer number (29645700).

Almost surely, 2^118535561 is an apocalyptic number.

It is an amenable number.

118535561 is a deficient number, since it is larger than the sum of its proper divisors (47239).

118535561 is an equidigital number, since it uses as much as digits as its factorization.

118535561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47238.

The product of its digits is 18000, while the sum is 35.

The square root of 118535561 is about 10887.4037768423. The cubic root of 118535561 is about 491.2277430798.

The spelling of 118535561 in words is "one hundred eighteen million, five hundred thirty-five thousand, five hundred sixty-one".