180561081 has 8 divisors (see below), whose sum is σ = 248514304. Its totient is φ = 116490960.

The previous prime is 180561079. The next prime is 180561091. The reversal of 180561081 is 180165081.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 180561081 - 2¹ = 180561079 is a prime.

It is a super-2 number, since 2×180561081² = 65204607943777122, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (180561061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 970666 + ... + 970851.

It is an arithmetic number, because the mean of its divisors is an integer number (31064288).

Almost surely, 2^180561081 is an apocalyptic number.

It is an amenable number.

180561081 is a deficient number, since it is larger than the sum of its proper divisors (67953223).

180561081 is a wasteful number, since it uses less digits than its factorization.

180561081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1941551.

The product of its (nonzero) digits is 1920, while the sum is 30.

The square root of 180561081 is about 13437.3018497018. The cubic root of 180561081 is about 565.2076726334.

The spelling of 180561081 in words is "one hundred eighty million, five hundred sixty-one thousand, eighty-one".