188145553 has 2 divisors, whose sum is σ = 188145554. Its totient is φ = 188145552.

The previous prime is 188145491. The next prime is 188145557. The reversal of 188145553 is 355541881.

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., 160351569 + 27793984 = 12663^2 + 5272^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-188145553 is a prime.

It is a super-2 number, since 2×188145553² = 70797498227351618, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (188145557) 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 as a sum of consecutive naturals, namely, 94072776 + 94072777.

It is an arithmetic number, because the mean of its divisors is an integer number (94072777).

Almost surely, 2^188145553 is an apocalyptic number.

It is an amenable number.

188145553 is a deficient number, since it is larger than the sum of its proper divisors (1).

188145553 is an equidigital number, since it uses as much as digits as its factorization.

188145553 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 96000, while the sum is 40.

The square root of 188145553 is about 13716.6159456332. The cubic root of 188145553 is about 573.0132343868.

The spelling of 188145553 in words is "one hundred eighty-eight million, one hundred forty-five thousand, five hundred fifty-three".