18065091 has 16 divisors (see below), whose sum is σ = 26640000. Its totient is φ = 10797120.

The previous prime is 18065083. The next prime is 18065107. The reversal of 18065091 is 19056081.

It is a happy number.

It is not a de Polignac number, because 18065091 - 2³ = 18065083 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18065081) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1341 + ... + 6158.

It is an arithmetic number, because the mean of its divisors is an integer number (1665000).

Almost surely, 2^18065091 is an apocalyptic number.

18065091 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

18065091 is a deficient number, since it is larger than the sum of its proper divisors (8574909).

18065091 is a wasteful number, since it uses less digits than its factorization.

18065091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7586.

The product of its (nonzero) digits is 2160, while the sum is 30.

The square root of 18065091 is about 4250.3048125987. The cubic root of 18065091 is about 262.3896606559.

The spelling of 18065091 in words is "eighteen million, sixty-five thousand, ninety-one".