109109391 has 16 divisors (see below), whose sum is σ = 147540960. Its totient is φ = 71715200.

The previous prime is 109109389. The next prime is 109109431. The reversal of 109109391 is 193901901.

It is a cyclic number.

It is not a de Polignac number, because 109109391 - 2¹ = 109109389 is a prime.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (109119391) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 88165 + ... + 89393.

It is an arithmetic number, because the mean of its divisors is an integer number (9221310).

Almost surely, 2^109109391 is an apocalyptic number.

109109391 is a deficient number, since it is larger than the sum of its proper divisors (38431569).

109109391 is a wasteful number, since it uses less digits than its factorization.

109109391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1626.

The product of its (nonzero) digits is 2187, while the sum is 33.

The square root of 109109391 is about 10445.5440739102. The cubic root of 109109391 is about 477.8453643926.

It can be divided in two parts, 10910 and 9391, that added together give a triangular number (20301 = T₂₀₁).

The spelling of 109109391 in words is "one hundred nine million, one hundred nine thousand, three hundred ninety-one".