189491221059 has 64 divisors (see below), whose sum is σ = 311602421760. Its totient is φ = 100001537280.

The previous prime is 189491220943. The next prime is 189491221159. The reversal of 189491221059 is 950122194981.

It is not a de Polignac number, because 189491221059 - 2²⁰ = 189490172483 is a prime.

It is not an unprimeable number, because it can be changed into a prime (189491221159) 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 63 ways as a sum of consecutive naturals, for example, 25238184 + ... + 25245690.

It is an arithmetic number, because the mean of its divisors is an integer number (4868787840).

Almost surely, 2^189491221059 is an apocalyptic number.

189491221059 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

189491221059 is a deficient number, since it is larger than the sum of its proper divisors (122111200701).

189491221059 is a wasteful number, since it uses less digits than its factorization.

189491221059 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9120.

The product of its (nonzero) digits is 466560, while the sum is 51.

The spelling of 189491221059 in words is "one hundred eighty-nine billion, four hundred ninety-one million, two hundred twenty-one thousand, fifty-nine".