18119691 has 6 divisors (see below), whose sum is σ = 26172900. Its totient is φ = 12079788.

The previous prime is 18119683. The next prime is 18119707. The reversal of 18119691 is 19691181.

It is not a de Polignac number, because 18119691 - 2³ = 18119683 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18119191) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1006641 + ... + 1006658.

It is an arithmetic number, because the mean of its divisors is an integer number (4362150).

Almost surely, 2^18119691 is an apocalyptic number.

18119691 is a deficient number, since it is larger than the sum of its proper divisors (8053209).

18119691 is a wasteful number, since it uses less digits than its factorization.

18119691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2013305 (or 2013302 counting only the distinct ones).

The product of its digits is 3888, while the sum is 36.

The square root of 18119691 is about 4256.7230353877. The cubic root of 18119691 is about 262.6537439495.

The spelling of 18119691 in words is "eighteen million, one hundred nineteen thousand, six hundred ninety-one".