188280121 has 2 divisors, whose sum is σ = 188280122. Its totient is φ = 188280120.

The previous prime is 188280097. The next prime is 188280133. The reversal of 188280121 is 121082881.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 122345721 + 65934400 = 11061^2 + 8120^2 .

It is a cyclic number.

It is not a de Polignac number, because 188280121 - 2¹¹ = 188278073 is a prime.

It is not a weakly prime, because it can be changed into another prime (188280821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 94140060 + 94140061.

It is an arithmetic number, because the mean of its divisors is an integer number (94140061).

Almost surely, 2^188280121 is an apocalyptic number.

It is an amenable number.

188280121 is a deficient number, since it is larger than the sum of its proper divisors (1).

188280121 is an equidigital number, since it uses as much as digits as its factorization.

188280121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2048, while the sum is 31.

The square root of 188280121 is about 13721.5203603682. The cubic root of 188280121 is about 573.1498145810.

The spelling of 188280121 in words is "one hundred eighty-eight million, two hundred eighty thousand, one hundred twenty-one".