118981 has 4 divisors (see below), whose sum is σ = 121792. Its totient is φ = 116172.
The previous prime is 118973. The next prime is 119027. The reversal of 118981 is 189811.
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: 189811 = 67 ⋅2833.
It is a cyclic number.
It is not a de Polignac number, because 118981 - 23 = 118973 is a prime.
It is a super-2 number, since 2×1189812 = 28312956722, which contains 22 as substring.
It is a Duffinian number.
118981 is a lucky number.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (118901) 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, 1341 + ... + 1426.
It is an arithmetic number, because the mean of its divisors is an integer number (30448).
2118981 is an apocalyptic number.
It is an amenable number.
118981 is a deficient number, since it is larger than the sum of its proper divisors (2811).
118981 is an equidigital number, since it uses as much as digits as its factorization.
118981 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 2810.
The product of its digits is 576, while the sum is 28.
The square root of 118981 is about 344.9362259897. The cubic root of 118981 is about 49.1842294179.
The spelling of 118981 in words is "one hundred eighteen thousand, nine hundred eighty-one".
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