109391491 has 4 divisors (see below), whose sum is σ = 119336184. Its totient is φ = 99446800.

The previous prime is 109391437. The next prime is 109391507. The reversal of 109391491 is 194193901.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 109391491 - 2¹¹ = 109389443 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 109391491.

It is not an unprimeable number, because it can be changed into a prime (109395491) 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, 4972330 + ... + 4972351.

It is an arithmetic number, because the mean of its divisors is an integer number (29834046).

Almost surely, 2^109391491 is an apocalyptic number.

109391491 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

109391491 is a deficient number, since it is larger than the sum of its proper divisors (9944693).

109391491 is an equidigital number, since it uses as much as digits as its factorization.

109391491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9944692.

The product of its (nonzero) digits is 8748, while the sum is 37.

The square root of 109391491 is about 10459.0387225595. The cubic root of 109391491 is about 478.2568296457.

The spelling of 109391491 in words is "one hundred nine million, three hundred ninety-one thousand, four hundred ninety-one".