118851981 has 8 divisors (see below), whose sum is σ = 167791104. Its totient is φ = 74573760.

The previous prime is 118851961. The next prime is 118852007. The reversal of 118851981 is 189158811.

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 118851981 - 2⁷ = 118851853 is a prime.

It is a super-2 number, since 2×118851981² = 28251586775248722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (118851911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1165165 + ... + 1165266.

It is an arithmetic number, because the mean of its divisors is an integer number (20973888).

Almost surely, 2^118851981 is an apocalyptic number.

It is an amenable number.

118851981 is a deficient number, since it is larger than the sum of its proper divisors (48939123).

118851981 is a wasteful number, since it uses less digits than its factorization.

118851981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2330451.

The product of its digits is 23040, while the sum is 42.

The square root of 118851981 is about 10901.9255638626. The cubic root of 118851981 is about 491.6644507928.

The spelling of 118851981 in words is "one hundred eighteen million, eight hundred fifty-one thousand, nine hundred eighty-one".