180081961 has 2 divisors, whose sum is σ = 180081962. Its totient is φ = 180081960.

The previous prime is 180081953. The next prime is 180081971. The reversal of 180081961 is 169180081.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 115777600 + 64304361 = 10760^2 + 8019^2 .

It is a cyclic number.

It is not a de Polignac number, because 180081961 - 2³ = 180081953 is a prime.

It is not a weakly prime, because it can be changed into another prime (180081971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 90040980 + 90040981.

It is an arithmetic number, because the mean of its divisors is an integer number (90040981).

Almost surely, 2^180081961 is an apocalyptic number.

It is an amenable number.

180081961 is a deficient number, since it is larger than the sum of its proper divisors (1).

180081961 is an equidigital number, since it uses as much as digits as its factorization.

180081961 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3456, while the sum is 34.

The square root of 180081961 is about 13419.4620234941. The cubic root of 180081961 is about 564.7073023846.

The spelling of 180081961 in words is "one hundred eighty million, eighty-one thousand, nine hundred sixty-one".