180694081 has 2 divisors, whose sum is σ = 180694082. Its totient is φ = 180694080.

The previous prime is 180694061. The next prime is 180694097. The reversal of 180694081 is 180496081.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 177023025 + 3671056 = 13305^2 + 1916^2 .

It is an emirp because it is prime and its reverse (180496081) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-180694081 is a prime.

It is a super-2 number, since 2×180694081² = 65300701816869122, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 180694081.

It is not a weakly prime, because it can be changed into another prime (180694061) 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 as a sum of consecutive naturals, namely, 90347040 + 90347041.

It is an arithmetic number, because the mean of its divisors is an integer number (90347041).

Almost surely, 2^180694081 is an apocalyptic number.

It is an amenable number.

180694081 is a deficient number, since it is larger than the sum of its proper divisors (1).

180694081 is an equidigital number, since it uses as much as digits as its factorization.

180694081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13824, while the sum is 37.

The square root of 180694081 is about 13442.2498488906. The cubic root of 180694081 is about 565.3464145491.

The spelling of 180694081 in words is "one hundred eighty million, six hundred ninety-four thousand, eighty-one".