161109099 has 6 divisors (see below), whose sum is σ = 232713156. Its totient is φ = 107406060.

The previous prime is 161109083. The next prime is 161109101. The reversal of 161109099 is 990901161.

161109099 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 161109099 - 2⁴ = 161109083 is a prime.

It is a super-2 number, since 2×161109099² = 51912283561183602, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (161109079) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 8950497 + ... + 8950514.

It is an arithmetic number, because the mean of its divisors is an integer number (38785526).

Almost surely, 2^161109099 is an apocalyptic number.

161109099 is a deficient number, since it is larger than the sum of its proper divisors (71604057).

161109099 is a wasteful number, since it uses less digits than its factorization.

161109099 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17901017 (or 17901014 counting only the distinct ones).

The product of its (nonzero) digits is 4374, while the sum is 36.

The square root of 161109099 is about 12692.8759152526. The cubic root of 161109099 is about 544.1350350964.

The spelling of 161109099 in words is "one hundred sixty-one million, one hundred nine thousand, ninety-nine".