118785281 has 4 divisors (see below), whose sum is σ = 121995732. Its totient is φ = 115574832.

The previous prime is 118785209. The next prime is 118785299. The reversal of 118785281 is 182587811.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 101687056 + 17098225 = 10084^2 + 4135^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-118785281 is a prime.

It is a super-2 number, since 2×118785281² = 28219885964497922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (118785181) 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, 1605170 + ... + 1605243.

It is an arithmetic number, because the mean of its divisors is an integer number (30498933).

Almost surely, 2^118785281 is an apocalyptic number.

It is an amenable number.

118785281 is a deficient number, since it is larger than the sum of its proper divisors (3210451).

118785281 is an equidigital number, since it uses as much as digits as its factorization.

118785281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3210450.

The product of its digits is 35840, while the sum is 41.

The square root of 118785281 is about 10898.8660419330. The cubic root of 118785281 is about 491.5724591822.

It can be divided in two parts, 1187 and 85281, that added together give a palindrome (86468).

The spelling of 118785281 in words is "one hundred eighteen million, seven hundred eighty-five thousand, two hundred eighty-one".