118578217 has 4 divisors (see below), whose sum is σ = 119100816. Its totient is φ = 118055620.

The previous prime is 118578209. The next prime is 118578269. The reversal of 118578217 is 712875811.

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: 712875811 = 53 ⋅13450487.

It is a cyclic number.

It is not a de Polignac number, because 118578217 - 2³ = 118578209 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 118578217.

It is not an unprimeable number, because it can be changed into a prime (118578277) 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, 260959 + ... + 261412.

It is an arithmetic number, because the mean of its divisors is an integer number (29775204).

Almost surely, 2^118578217 is an apocalyptic number.

It is an amenable number.

118578217 is a deficient number, since it is larger than the sum of its proper divisors (522599).

118578217 is an equidigital number, since it uses as much as digits as its factorization.

118578217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 522598.

The product of its digits is 31360, while the sum is 40.

The square root of 118578217 is about 10889.3625616929. The cubic root of 118578217 is about 491.2866601323.

The spelling of 118578217 in words is "one hundred eighteen million, five hundred seventy-eight thousand, two hundred seventeen".