189221961 has 4 divisors (see below), whose sum is σ = 252295952. Its totient is φ = 126147972.

The previous prime is 189221947. The next prime is 189221971. The reversal of 189221961 is 169122981.

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, and also an emirpimes, since its reverse is a distinct semiprime: 169122981 = 3 ⋅56374327.

It is not a de Polignac number, because 189221961 - 2¹¹ = 189219913 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (189221971) 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 in 3 ways as a sum of consecutive naturals, for example, 31536991 + ... + 31536996.

It is an arithmetic number, because the mean of its divisors is an integer number (63073988).

Almost surely, 2^189221961 is an apocalyptic number.

It is an amenable number.

189221961 is a deficient number, since it is larger than the sum of its proper divisors (63073991).

189221961 is an equidigital number, since it uses as much as digits as its factorization.

189221961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63073990.

The product of its digits is 15552, while the sum is 39.

The square root of 189221961 is about 13755.7973596589. The cubic root of 189221961 is about 574.1039209755.

The spelling of 189221961 in words is "one hundred eighty-nine million, two hundred twenty-one thousand, nine hundred sixty-one".