18085961 has 4 divisors (see below), whose sum is σ = 18527124. Its totient is φ = 17644800.

The previous prime is 18085931. The next prime is 18085973. The reversal of 18085961 is 16958081.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 10627600 + 7458361 = 3260^2 + 2731^2 .

It is a cyclic number.

It is not a de Polignac number, because 18085961 - 2⁶ = 18085897 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (18085931) 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, 220520 + ... + 220601.

It is an arithmetic number, because the mean of its divisors is an integer number (4631781).

Almost surely, 2^18085961 is an apocalyptic number.

It is an amenable number.

18085961 is a deficient number, since it is larger than the sum of its proper divisors (441163).

18085961 is an equidigital number, since it uses as much as digits as its factorization.

18085961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 441162.

The product of its (nonzero) digits is 17280, while the sum is 38.

The square root of 18085961 is about 4252.7592219640. The cubic root of 18085961 is about 262.4906651253.

The spelling of 18085961 in words is "eighteen million, eighty-five thousand, nine hundred sixty-one".