118883981 has 4 divisors (see below), whose sum is σ = 118907964. Its totient is φ = 118860000.

The previous prime is 118883959. The next prime is 118883983. The reversal of 118883981 is 189388811.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 189388811 = 1993 ⋅95027.

It can be written as a sum of positive squares in 2 ways, for example, as 91489225 + 27394756 = 9565^2 + 5234^2 .

It is a cyclic number.

It is not a de Polignac number, because 118883981 - 2⁶ = 118883917 is a prime.

It is a super-2 number, since 2×118883981² = 28266801876816722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (118883983) 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, 1490 + ... + 15491.

It is an arithmetic number, because the mean of its divisors is an integer number (29726991).

Almost surely, 2^118883981 is an apocalyptic number.

It is an amenable number.

118883981 is a deficient number, since it is larger than the sum of its proper divisors (23983).

118883981 is an equidigital number, since it uses as much as digits as its factorization.

118883981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23982.

The product of its digits is 110592, while the sum is 47.

The square root of 118883981 is about 10903.3930957294. The cubic root of 118883981 is about 491.7085724823.

The spelling of 118883981 in words is "one hundred eighteen million, eight hundred eighty-three thousand, nine hundred eighty-one".