180398081 has 2 divisors, whose sum is σ = 180398082. Its totient is φ = 180398080.

The previous prime is 180398047. The next prime is 180398087. The reversal of 180398081 is 180893081.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 153264400 + 27133681 = 12380^2 + 5209^2 .

It is a cyclic number.

It is not a de Polignac number, because 180398081 - 2¹⁰ = 180397057 is a prime.

It is a super-2 number, since 2×180398081² = 65086935256965122, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (180398087) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 90199040 + 90199041.

It is an arithmetic number, because the mean of its divisors is an integer number (90199041).

Almost surely, 2^180398081 is an apocalyptic number.

It is an amenable number.

180398081 is a deficient number, since it is larger than the sum of its proper divisors (1).

180398081 is an equidigital number, since it uses as much as digits as its factorization.

180398081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13824, while the sum is 38.

The square root of 180398081 is about 13431.2352745382. The cubic root of 180398081 is about 565.0375426015.

The spelling of 180398081 in words is "one hundred eighty million, three hundred ninety-eight thousand, eighty-one".