189551 has 8 divisors (see below), whose sum is σ = 200640. Its totient is φ = 178848.

The previous prime is 189547. The next prime is 189559. The reversal of 189551 is 155981.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 189551 - 2² = 189547 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (189559) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1685 + ... + 1793.

It is an arithmetic number, because the mean of its divisors is an integer number (25080).

2¹⁸⁹⁵⁵¹ is an apocalyptic number.

189551 is a deficient number, since it is larger than the sum of its proper divisors (11089).

189551 is a wasteful number, since it uses less digits than its factorization.

189551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 193.

The product of its digits is 1800, while the sum is 29.

The square root of 189551 is about 435.3745513922. The cubic root of 189551 is about 57.4436498988.

The spelling of 189551 in words is "one hundred eighty-nine thousand, five hundred fifty-one".