188080721 has 2 divisors, whose sum is σ = 188080722. Its totient is φ = 188080720.

The previous prime is 188080709. The next prime is 188080801. The reversal of 188080721 is 127080881.

188080721 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., 150430225 + 37650496 = 12265^2 + 6136^2 .

It is an emirp because it is prime and its reverse (127080881) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 188080721 - 2¹⁸ = 187818577 is a prime.

It is a super-2 number, since 2×188080721² = 70748715223759682, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (188080021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 94040360 + 94040361.

It is an arithmetic number, because the mean of its divisors is an integer number (94040361).

Almost surely, 2^188080721 is an apocalyptic number.

It is an amenable number.

188080721 is a deficient number, since it is larger than the sum of its proper divisors (1).

188080721 is an equidigital number, since it uses as much as digits as its factorization.

188080721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7168, while the sum is 35.

The square root of 188080721 is about 13714.2524768942. The cubic root of 188080721 is about 572.9474097078.

The spelling of 188080721 in words is "one hundred eighty-eight million, eighty thousand, seven hundred twenty-one".