189819601 has 2 divisors, whose sum is σ = 189819602. Its totient is φ = 189819600.

The previous prime is 189819599. The next prime is 189819611. The reversal of 189819601 is 106918981.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 169026001 + 20793600 = 13001^2 + 4560^2 .

It is a cyclic number.

It is not a de Polignac number, because 189819601 - 2¹ = 189819599 is a prime.

Together with 189819599, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (189819611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 94909800 + 94909801.

It is an arithmetic number, because the mean of its divisors is an integer number (94909801).

Almost surely, 2^189819601 is an apocalyptic number.

It is an amenable number.

189819601 is a deficient number, since it is larger than the sum of its proper divisors (1).

189819601 is an equidigital number, since it uses as much as digits as its factorization.

189819601 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 31104, while the sum is 43.

The square root of 189819601 is about 13777.5034385770. The cubic root of 189819601 is about 574.7077037388.

It can be divided in two parts, 18981 and 9601, that added together give a palindrome (28582).

The spelling of 189819601 in words is "one hundred eighty-nine million, eight hundred nineteen thousand, six hundred one".