189789961 has 4 divisors (see below), whose sum is σ = 193006800. Its totient is φ = 186573124.

The previous prime is 189789953. The next prime is 189790019. The reversal of 189789961 is 169987981.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 189789961 - 2³ = 189789953 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 189789896 and 189789905.

It is not an unprimeable number, because it can be changed into a prime (189789911) 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 in 3 ways as a sum of consecutive naturals, for example, 1608331 + ... + 1608448.

It is an arithmetic number, because the mean of its divisors is an integer number (48251700).

Almost surely, 2^189789961 is an apocalyptic number.

It is an amenable number.

189789961 is a deficient number, since it is larger than the sum of its proper divisors (3216839).

189789961 is an equidigital number, since it uses as much as digits as its factorization.

189789961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3216838.

The product of its digits is 1959552, while the sum is 58.

The square root of 189789961 is about 13776.4277300032. The cubic root of 189789961 is about 574.6777889795.

The spelling of 189789961 in words is "one hundred eighty-nine million, seven hundred eighty-nine thousand, nine hundred sixty-one".