218109099 has 32 divisors (see below), whose sum is σ = 337103424. Its totient is φ = 124231680.

The previous prime is 218108993. The next prime is 218109103. The reversal of 218109099 is 990901812.

It is a happy number.

It is not a de Polignac number, because 218109099 - 2⁹ = 218108587 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is not an unprimeable number, because it can be changed into a prime (218109499) 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, 37747 + ... + 43139.

It is an arithmetic number, because the mean of its divisors is an integer number (10534482).

Almost surely, 2^218109099 is an apocalyptic number.

218109099 is a deficient number, since it is larger than the sum of its proper divisors (118994325).

218109099 is a wasteful number, since it uses less digits than its factorization.

218109099 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5487.

The product of its (nonzero) digits is 11664, while the sum is 39.

The square root of 218109099 is about 14768.5171564379. The cubic root of 218109099 is about 601.9465475364.

The spelling of 218109099 in words is "two hundred eighteen million, one hundred nine thousand, ninety-nine".