180668731 has 2 divisors, whose sum is σ = 180668732. Its totient is φ = 180668730.

The previous prime is 180668729. The next prime is 180668767. The reversal of 180668731 is 137866081.

180668731 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 is an emirp because it is prime and its reverse (137866081) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 180668731 - 2¹ = 180668729 is a prime.

It is a super-2 number, since 2×180668731² = 65282380722300722, which contains 22 as substring.

Together with 180668729, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (180668771) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 90334365 + 90334366.

It is an arithmetic number, because the mean of its divisors is an integer number (90334366).

Almost surely, 2^180668731 is an apocalyptic number.

180668731 is a deficient number, since it is larger than the sum of its proper divisors (1).

180668731 is an equidigital number, since it uses as much as digits as its factorization.

180668731 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 48384, while the sum is 40.

The square root of 180668731 is about 13441.3068933047. The cubic root of 180668731 is about 565.3199753841.

The spelling of 180668731 in words is "one hundred eighty million, six hundred sixty-eight thousand, seven hundred thirty-one".