188820257 has 2 divisors, whose sum is σ = 188820258. Its totient is φ = 188820256.

The previous prime is 188820251. The next prime is 188820283. The reversal of 188820257 is 752028881.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 157728481 + 31091776 = 12559^2 + 5576^2 .

It is a cyclic number.

It is not a de Polignac number, because 188820257 - 2²² = 184625953 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (188820251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 94410128 + 94410129.

It is an arithmetic number, because the mean of its divisors is an integer number (94410129).

Almost surely, 2^188820257 is an apocalyptic number.

It is an amenable number.

188820257 is a deficient number, since it is larger than the sum of its proper divisors (1).

188820257 is an equidigital number, since it uses as much as digits as its factorization.

188820257 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 71680, while the sum is 41.

The square root of 188820257 is about 13741.1883401691. The cubic root of 188820257 is about 573.6973733261.

The spelling of 188820257 in words is "one hundred eighty-eight million, eight hundred twenty thousand, two hundred fifty-seven".