109581138 has 24 divisors (see below), whose sum is σ = 237619200. Its totient is φ = 36497304.

The previous prime is 109581127. The next prime is 109581139. The reversal of 109581138 is 831185901.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (109581139) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 38943 + ... + 41661.

It is an arithmetic number, because the mean of its divisors is an integer number (9900800).

Almost surely, 2^109581138 is an apocalyptic number.

109581138 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

109581138 is an abundant number, since it is smaller than the sum of its proper divisors (128038062).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

109581138 is a wasteful number, since it uses less digits than its factorization.

109581138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4966 (or 4963 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 36.

The square root of 109581138 is about 10468.1009739112. The cubic root of 109581138 is about 478.5330473797.

The spelling of 109581138 in words is "one hundred nine million, five hundred eighty-one thousand, one hundred thirty-eight".