16180081 has 4 divisors (see below), whose sum is σ = 16240500. Its totient is φ = 16119664.

The previous prime is 16180037. The next prime is 16180091. The reversal of 16180081 is 18008161.

It is a happy number.

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 2608225 + 13571856 = 1615^2 + 3684^2 .

It is a cyclic number.

It is not a de Polignac number, because 16180081 - 2¹³ = 16171889 is a prime.

It is a super-2 number, since 2×16180081² = 523590042333122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16180091) 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, 29806 + ... + 30343.

It is an arithmetic number, because the mean of its divisors is an integer number (4060125).

Almost surely, 2^16180081 is an apocalyptic number.

It is an amenable number.

16180081 is a deficient number, since it is larger than the sum of its proper divisors (60419).

16180081 is an equidigital number, since it uses as much as digits as its factorization.

16180081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60418.

The product of its (nonzero) digits is 384, while the sum is 25.

The square root of 16180081 is about 4022.4471407341. The cubic root of 16180081 is about 252.9260512838.

The spelling of 16180081 in words is "sixteen million, one hundred eighty thousand, eighty-one".