109020091 has 4 divisors (see below), whose sum is σ = 109368712. Its totient is φ = 108671472.

The previous prime is 109020083. The next prime is 109020097. The reversal of 109020091 is 190020901.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 190020901 = 7 ⋅27145843.

It is a cyclic number.

It is not a de Polignac number, because 109020091 - 2³ = 109020083 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (109020097) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 173841 + ... + 174466.

It is an arithmetic number, because the mean of its divisors is an integer number (27342178).

Almost surely, 2^109020091 is an apocalyptic number.

109020091 is a deficient number, since it is larger than the sum of its proper divisors (348621).

109020091 is an equidigital number, since it uses as much as digits as its factorization.

109020091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 348620.

The product of its (nonzero) digits is 162, while the sum is 22.

The square root of 109020091 is about 10441.2686489717. The cubic root of 109020091 is about 477.7149654801.

Adding to 109020091 its reverse (190020901), we get a palindrome (299040992).

The spelling of 109020091 in words is "one hundred nine million, twenty thousand, ninety-one".