180533681 has 2 divisors, whose sum is σ = 180533682. Its totient is φ = 180533680.

The previous prime is 180533657. The next prime is 180533707. The reversal of 180533681 is 186335081.

180533681 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 149842081 + 30691600 = 12241^2 + 5540^2 .

It is an emirp because it is prime and its reverse (186335081) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 180533681 - 2¹⁴ = 180517297 is a prime.

It is a super-2 number, since 2×180533681² = 65184819950819522, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (180533981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 90266840 + 90266841.

It is an arithmetic number, because the mean of its divisors is an integer number (90266841).

Almost surely, 2^180533681 is an apocalyptic number.

It is an amenable number.

180533681 is a deficient number, since it is larger than the sum of its proper divisors (1).

180533681 is an equidigital number, since it uses as much as digits as its factorization.

180533681 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 17280, while the sum is 35.

The square root of 180533681 is about 13436.2822611018. The cubic root of 180533681 is about 565.1790812493.

The spelling of 180533681 in words is "one hundred eighty million, five hundred thirty-three thousand, six hundred eighty-one".