109142081 has 4 divisors (see below), whose sum is σ = 110637252. Its totient is φ = 107646912.

The previous prime is 109142069. The next prime is 109142141. The reversal of 109142081 is 180241901.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 180241901 = 7 ⋅25748843.

It can be written as a sum of positive squares in 2 ways, for example, as 51609856 + 57532225 = 7184^2 + 7585^2 .

It is a cyclic number.

It is not a de Polignac number, because 109142081 - 2⁶ = 109142017 is a prime.

It is a super-2 number, since 2×109142081² = 23823987690021122, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 109142081.

It is not an unprimeable number, because it can be changed into a prime (109142021) 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, 747476 + ... + 747621.

It is an arithmetic number, because the mean of its divisors is an integer number (27659313).

Almost surely, 2^109142081 is an apocalyptic number.

It is an amenable number.

109142081 is a deficient number, since it is larger than the sum of its proper divisors (1495171).

109142081 is an equidigital number, since it uses as much as digits as its factorization.

109142081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1495170.

The product of its (nonzero) digits is 576, while the sum is 26.

The square root of 109142081 is about 10447.1087387851. The cubic root of 109142081 is about 477.8930816577.

Adding to 109142081 its reverse (180241901), we get a palindrome (289383982).

The spelling of 109142081 in words is "one hundred nine million, one hundred forty-two thousand, eighty-one".