180067721 has 2 divisors, whose sum is σ = 180067722. Its totient is φ = 180067720.

The previous prime is 180067717. The next prime is 180067739. The reversal of 180067721 is 127760081.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 95335696 + 84732025 = 9764^2 + 9205^2 .

It is an emirp because it is prime and its reverse (127760081) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 180067721 - 2² = 180067717 is a prime.

It is a super-2 number, since 2×180067721² = 64848768292267682, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (180067751) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 90033860 + 90033861.

It is an arithmetic number, because the mean of its divisors is an integer number (90033861).

Almost surely, 2^180067721 is an apocalyptic number.

It is an amenable number.

180067721 is a deficient number, since it is larger than the sum of its proper divisors (1).

180067721 is an equidigital number, since it uses as much as digits as its factorization.

180067721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4704, while the sum is 32.

The square root of 180067721 is about 13418.9314403197. The cubic root of 180067721 is about 564.6924172292.

The spelling of 180067721 in words is "one hundred eighty million, sixty-seven thousand, seven hundred twenty-one".