118429981 has 4 divisors (see below), whose sum is σ = 118867264. Its totient is φ = 117992700.

The previous prime is 118429963. The next prime is 118429991. The reversal of 118429981 is 189924811.

It is a happy number.

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.

It is a cyclic number.

It is not a de Polignac number, because 118429981 - 2¹³ = 118421789 is a prime.

It is a super-2 number, since 2×118429981² = 28051320799320722, 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 (118429991) 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, 218235 + ... + 218776.

It is an arithmetic number, because the mean of its divisors is an integer number (29716816).

Almost surely, 2^118429981 is an apocalyptic number.

It is an amenable number.

118429981 is a deficient number, since it is larger than the sum of its proper divisors (437283).

118429981 is an equidigital number, since it uses as much as digits as its factorization.

118429981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 437282.

The product of its digits is 41472, while the sum is 43.

The square root of 118429981 is about 10882.5539741368. The cubic root of 118429981 is about 491.0818537204.

The spelling of 118429981 in words is "one hundred eighteen million, four hundred twenty-nine thousand, nine hundred eighty-one".