118206981 has 12 divisors (see below), whose sum is σ = 170838720. Its totient is φ = 78760680.

The previous prime is 118206943. The next prime is 118206983. The reversal of 118206981 is 189602811.

It is not a de Polignac number, because 118206981 - 2¹⁵ = 118174213 is a prime.

It is a super-2 number, since 2×118206981² = 27945780714268722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (118206983) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 25966 + ... + 30176.

It is an arithmetic number, because the mean of its divisors is an integer number (14236560).

Almost surely, 2^118206981 is an apocalyptic number.

It is an amenable number.

118206981 is a deficient number, since it is larger than the sum of its proper divisors (52631739).

118206981 is a wasteful number, since it uses less digits than its factorization.

118206981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7336 (or 7333 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 36.

The square root of 118206981 is about 10872.3033898066. The cubic root of 118206981 is about 490.7734293955.

The spelling of 118206981 in words is "one hundred eighteen million, two hundred six thousand, nine hundred eighty-one".