188263121 has 2 divisors, whose sum is σ = 188263122. Its totient is φ = 188263120.

The previous prime is 188263087. The next prime is 188263123. The reversal of 188263121 is 121362881.

188263121 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 143520400 + 44742721 = 11980^2 + 6689^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-188263121 is a prime.

It is a Sophie Germain prime.

Together with 188263123, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (188263123) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 94131560 + 94131561.

It is an arithmetic number, because the mean of its divisors is an integer number (94131561).

Almost surely, 2^188263121 is an apocalyptic number.

It is an amenable number.

188263121 is a deficient number, since it is larger than the sum of its proper divisors (1).

188263121 is an equidigital number, since it uses as much as digits as its factorization.

188263121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4608, while the sum is 32.

The square root of 188263121 is about 13720.9008815019. The cubic root of 188263121 is about 573.1325639722.

The spelling of 188263121 in words is "one hundred eighty-eight million, two hundred sixty-three thousand, one hundred twenty-one".