180650681 has 2 divisors, whose sum is σ = 180650682. Its totient is φ = 180650680.

The previous prime is 180650677. The next prime is 180650683. The reversal of 180650681 is 186056081.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 176650681 + 4000000 = 13291^2 + 2000^2 .

It is an emirp because it is prime and its reverse (186056081) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 180650681 - 2² = 180650677 is a prime.

It is a super-2 number, since 2×180650681² = 65269337091527522, which contains 22 as substring.

Together with 180650683, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (180650683) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 90325340 + 90325341.

It is an arithmetic number, because the mean of its divisors is an integer number (90325341).

Almost surely, 2^180650681 is an apocalyptic number.

It is an amenable number.

180650681 is a deficient number, since it is larger than the sum of its proper divisors (1).

180650681 is an equidigital number, since it uses as much as digits as its factorization.

180650681 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11520, while the sum is 35.

The square root of 180650681 is about 13440.6354388474. The cubic root of 180650681 is about 565.3011483568.

The spelling of 180650681 in words is "one hundred eighty million, six hundred fifty thousand, six hundred eighty-one".