109111681 has 6 divisors (see below), whose sum is σ = 126925890. Its totient is φ = 93524256.

The previous prime is 109111649. The next prime is 109111693. The reversal of 109111681 is 186111901.

It can be written as a sum of positive squares in only one way, i.e., 70560000 + 38551681 = 8400^2 + 6209^2 .

It is not a de Polignac number, because 109111681 - 2⁵ = 109111649 is a prime.

It is a super-2 number, since 2×109111681² = 23810717861291522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (109111181) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1113336 + ... + 1113433.

It is an arithmetic number, because the mean of its divisors is an integer number (21154315).

Almost surely, 2^109111681 is an apocalyptic number.

It is an amenable number.

109111681 is a deficient number, since it is larger than the sum of its proper divisors (17814209).

109111681 is an equidigital number, since it uses as much as digits as its factorization.

109111681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2226783 (or 2226776 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 28.

The square root of 109111681 is about 10445.6536894538. The cubic root of 109111681 is about 477.8487073931.

The spelling of 109111681 in words is "one hundred nine million, one hundred eleven thousand, six hundred eighty-one".