180634681 has 8 divisors (see below), whose sum is σ = 182714184. Its totient is φ = 178563840.

The previous prime is 180634669. The next prime is 180634687. The reversal of 180634681 is 186436081.

It can be written as a sum of positive squares in 4 ways, for example, as 62173225 + 118461456 = 7885^2 + 10884^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 180634681 - 2¹⁵ = 180601913 is a prime.

It is a super-2 number, since 2×180634681² = 65257775959943522, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 180634681.

It is not an unprimeable number, because it can be changed into a prime (180634687) 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 in 7 ways as a sum of consecutive naturals, for example, 45675 + ... + 49471.

It is an arithmetic number, because the mean of its divisors is an integer number (22839273).

Almost surely, 2^180634681 is an apocalyptic number.

It is an amenable number.

180634681 is a deficient number, since it is larger than the sum of its proper divisors (2079503).

180634681 is a wasteful number, since it uses less digits than its factorization.

180634681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4331.

The product of its (nonzero) digits is 27648, while the sum is 37.

The square root of 180634681 is about 13440.0402157136. The cubic root of 180634681 is about 565.2844585306.

The spelling of 180634681 in words is "one hundred eighty million, six hundred thirty-four thousand, six hundred eighty-one".