180616081 has 2 divisors, whose sum is σ = 180616082. Its totient is φ = 180616080.

The previous prime is 180616067. The next prime is 180616091.

It is a happy number.

180616081 is nontrivially palindromic in base 10.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 123099025 + 57517056 = 11095^2 + 7584^2 .

It is a palprime.

It is a cyclic number.

It is not a de Polignac number, because 180616081 - 2¹⁵ = 180583313 is a prime.

It is a super-2 number, since 2×180616081² = 65244337431597122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (180616001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 90308040 + 90308041.

It is an arithmetic number, because the mean of its divisors is an integer number (90308041).

Almost surely, 2^180616081 is an apocalyptic number.

It is an amenable number.

180616081 is a deficient number, since it is larger than the sum of its proper divisors (1).

180616081 is an equidigital number, since it uses as much as digits as its factorization.

180616081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2304, while the sum is 31.

The square root of 180616081 is about 13439.3482356846. The cubic root of 180616081 is about 565.2650553687.

It can be divided in two parts, 18061 and 6081, that added together give a palindrome (24142).

The spelling of 180616081 in words is "one hundred eighty million, six hundred sixteen thousand, eighty-one".