188812321 has 2 divisors, whose sum is σ = 188812322. Its totient is φ = 188812320.

The previous prime is 188812279. The next prime is 188812333. The reversal of 188812321 is 123218881.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 184552225 + 4260096 = 13585^2 + 2064^2 .

It is a cyclic number.

It is not a de Polignac number, because 188812321 - 2⁷ = 188812193 is a prime.

It is a super-2 number, since 2×188812321² = 71300185122814082, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (188812361) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 94406160 + 94406161.

It is an arithmetic number, because the mean of its divisors is an integer number (94406161).

Almost surely, 2^188812321 is an apocalyptic number.

It is an amenable number.

188812321 is a deficient number, since it is larger than the sum of its proper divisors (1).

188812321 is an equidigital number, since it uses as much as digits as its factorization.

188812321 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6144, while the sum is 34.

The square root of 188812321 is about 13740.8995702610. The cubic root of 188812321 is about 573.6893358302.

The spelling of 188812321 in words is "one hundred eighty-eight million, eight hundred twelve thousand, three hundred twenty-one".