189819653 has 2 divisors, whose sum is σ = 189819654. Its totient is φ = 189819652.

The previous prime is 189819647. The next prime is 189819677. The reversal of 189819653 is 356918981.

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., 189805729 + 13924 = 13777^2 + 118^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-189819653 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (189819683) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 94909826 + 94909827.

It is an arithmetic number, because the mean of its divisors is an integer number (94909827).

Almost surely, 2^189819653 is an apocalyptic number.

It is an amenable number.

189819653 is a deficient number, since it is larger than the sum of its proper divisors (1).

189819653 is an equidigital number, since it uses as much as digits as its factorization.

189819653 is an evil number, because the sum of its binary digits is even.

The product of its digits is 466560, while the sum is 50.

The square root of 189819653 is about 13777.5053257112. The cubic root of 189819653 is about 574.7077562181.

The spelling of 189819653 in words is "one hundred eighty-nine million, eight hundred nineteen thousand, six hundred fifty-three".