189510661 has 2 divisors, whose sum is σ = 189510662. Its totient is φ = 189510660.

The previous prime is 189510653. The next prime is 189510691. The reversal of 189510661 is 166015981.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 187169761 + 2340900 = 13681^2 + 1530^2 .

It is a cyclic number.

It is not a de Polignac number, because 189510661 - 2³ = 189510653 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 189510661.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (189510641) 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, 94755330 + 94755331.

It is an arithmetic number, because the mean of its divisors is an integer number (94755331).

Almost surely, 2^189510661 is an apocalyptic number.

It is an amenable number.

189510661 is a deficient number, since it is larger than the sum of its proper divisors (1).

189510661 is an equidigital number, since it uses as much as digits as its factorization.

189510661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12960, while the sum is 37.

The square root of 189510661 is about 13766.2871174475. The cubic root of 189510661 is about 574.3957468283.

The spelling of 189510661 in words is "one hundred eighty-nine million, five hundred ten thousand, six hundred sixty-one".