118209091 has 32 divisors (see below), whose sum is σ = 159667200. Its totient is φ = 84516480.

The previous prime is 118209073. The next prime is 118209103. The reversal of 118209091 is 190902811.

It is a cyclic number.

It is not a de Polignac number, because 118209091 - 2⁵ = 118209059 is a prime.

It is not an unprimeable number, because it can be changed into a prime (118209011) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 269050 + ... + 269488.

It is an arithmetic number, because the mean of its divisors is an integer number (4989600).

Almost surely, 2^118209091 is an apocalyptic number.

118209091 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

118209091 is a deficient number, since it is larger than the sum of its proper divisors (41458109).

118209091 is a wasteful number, since it uses less digits than its factorization.

118209091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 739.

The product of its (nonzero) digits is 1296, while the sum is 31.

The square root of 118209091 is about 10872.4004249292. The cubic root of 118209091 is about 490.7763494875.

The spelling of 118209091 in words is "one hundred eighteen million, two hundred nine thousand, ninety-one".