118945509 has 4 divisors (see below), whose sum is σ = 158594016. Its totient is φ = 79297004.

The previous prime is 118945507. The next prime is 118945513. The reversal of 118945509 is 905549811.

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 118945509 - 2¹ = 118945507 is a prime.

It is a super-2 number, since 2×118945509² = 28296068222538162, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (118945507) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19824249 + ... + 19824254.

It is an arithmetic number, because the mean of its divisors is an integer number (39648504).

Almost surely, 2^118945509 is an apocalyptic number.

It is an amenable number.

118945509 is a deficient number, since it is larger than the sum of its proper divisors (39648507).

118945509 is an equidigital number, since it uses as much as digits as its factorization.

118945509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39648506.

The product of its (nonzero) digits is 64800, while the sum is 42.

The square root of 118945509 is about 10906.2142377637. The cubic root of 118945509 is about 491.7933852189.

The spelling of 118945509 in words is "one hundred eighteen million, nine hundred forty-five thousand, five hundred nine".