109115491 has 4 divisors (see below), whose sum is σ = 109141984. Its totient is φ = 109089000.

The previous prime is 109115483. The next prime is 109115527. The reversal of 109115491 is 194511901.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 194511901 = 149 ⋅1305449.

It is a cyclic number.

It is not a de Polignac number, because 109115491 - 2³ = 109115483 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (109115411) 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, 5595 + ... + 15796.

It is an arithmetic number, because the mean of its divisors is an integer number (27285496).

Almost surely, 2^109115491 is an apocalyptic number.

109115491 is a deficient number, since it is larger than the sum of its proper divisors (26493).

109115491 is an equidigital number, since it uses as much as digits as its factorization.

109115491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26492.

The product of its (nonzero) digits is 1620, while the sum is 31.

The square root of 109115491 is about 10445.8360603640. The cubic root of 109115491 is about 477.8542692247.

It can be divided in two parts, 109 and 115491, that added together give a square (115600 = 340²).

The spelling of 109115491 in words is "one hundred nine million, one hundred fifteen thousand, four hundred ninety-one".