189673561 has 24 divisors (see below), whose sum is σ = 253380960. Its totient is φ = 140011200.

The previous prime is 189673541. The next prime is 189673619. The reversal of 189673561 is 165376981.

It is a happy number.

It is not a de Polignac number, because 189673561 - 2⁹ = 189673049 is a prime.

It is not an unprimeable number, because it can be changed into a prime (189673541) 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 23 ways as a sum of consecutive naturals, for example, 981 + ... + 19501.

It is an arithmetic number, because the mean of its divisors is an integer number (10557540).

Almost surely, 2^189673561 is an apocalyptic number.

189673561 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

189673561 is a deficient number, since it is larger than the sum of its proper divisors (63707399).

189673561 is a wasteful number, since it uses less digits than its factorization.

189673561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18565 (or 18558 counting only the distinct ones).

The product of its digits is 272160, while the sum is 46.

The square root of 189673561 is about 13772.2024745500. The cubic root of 189673561 is about 574.5602798232.

It can be divided in two parts, 1896 and 73561, that added together give a palindrome (75457).

The spelling of 189673561 in words is "one hundred eighty-nine million, six hundred seventy-three thousand, five hundred sixty-one".