189657961 has 2 divisors, whose sum is σ = 189657962. Its totient is φ = 189657960.

The previous prime is 189657959. The next prime is 189658003. The reversal of 189657961 is 169756981.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 168091225 + 21566736 = 12965^2 + 4644^2 .

It is a cyclic number.

It is not a de Polignac number, because 189657961 - 2¹ = 189657959 is a prime.

Together with 189657959, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 189657899 and 189657908.

It is not a weakly prime, because it can be changed into another prime (189657761) 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, 94828980 + 94828981.

It is an arithmetic number, because the mean of its divisors is an integer number (94828981).

Almost surely, 2^189657961 is an apocalyptic number.

It is an amenable number.

189657961 is a deficient number, since it is larger than the sum of its proper divisors (1).

189657961 is an equidigital number, since it uses as much as digits as its factorization.

189657961 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 816480, while the sum is 52.

The square root of 189657961 is about 13771.6361046900. The cubic root of 189657961 is about 574.5445275204.

The spelling of 189657961 in words is "one hundred eighty-nine million, six hundred fifty-seven thousand, nine hundred sixty-one".