188561321 has 16 divisors (see below), whose sum is σ = 212239104. Its totient is φ = 166368384.

The previous prime is 188561299. The next prime is 188561323. The reversal of 188561321 is 123165881.

It is not a de Polignac number, because 188561321 - 2²² = 184367017 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (188561323) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22685 + ... + 29861.

It is an arithmetic number, because the mean of its divisors is an integer number (13264944).

Almost surely, 2^188561321 is an apocalyptic number.

It is an amenable number.

188561321 is a deficient number, since it is larger than the sum of its proper divisors (23677783).

188561321 is a wasteful number, since it uses less digits than its factorization.

188561321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7280.

The product of its digits is 11520, while the sum is 35.

The square root of 188561321 is about 13731.7632152612. The cubic root of 188561321 is about 573.4350094223.

The spelling of 188561321 in words is "one hundred eighty-eight million, five hundred sixty-one thousand, three hundred twenty-one".