18955091 has 4 divisors (see below), whose sum is σ = 19064832. Its totient is φ = 18845352.

The previous prime is 18955087. The next prime is 18955093. The reversal of 18955091 is 19055981.

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 18955091 - 2² = 18955087 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18955093) 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, 54611 + ... + 54956.

It is an arithmetic number, because the mean of its divisors is an integer number (4766208).

Almost surely, 2^18955091 is an apocalyptic number.

18955091 is a deficient number, since it is larger than the sum of its proper divisors (109741).

18955091 is a wasteful number, since it uses less digits than its factorization.

18955091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109740.

The product of its (nonzero) digits is 16200, while the sum is 38.

The square root of 18955091 is about 4353.7444803295. The cubic root of 18955091 is about 266.6297617331.

The spelling of 18955091 in words is "eighteen million, nine hundred fifty-five thousand, ninety-one".