118218261 has 8 divisors (see below), whose sum is σ = 180142144. Its totient is φ = 67553280.

The previous prime is 118218251. The next prime is 118218277. The reversal of 118218261 is 162812811.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 118218261 - 2¹⁰ = 118217237 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (118218251) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2814700 + ... + 2814741.

It is an arithmetic number, because the mean of its divisors is an integer number (22517768).

Almost surely, 2^118218261 is an apocalyptic number.

It is an amenable number.

118218261 is a deficient number, since it is larger than the sum of its proper divisors (61923883).

118218261 is an equidigital number, since it uses as much as digits as its factorization.

118218261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5629451.

The product of its digits is 1536, while the sum is 30.

The square root of 118218261 is about 10872.8221267526. The cubic root of 118218261 is about 490.7890397206.

The spelling of 118218261 in words is "one hundred eighteen million, two hundred eighteen thousand, two hundred sixty-one".