189161587 has 8 divisors (see below), whose sum is σ = 201090960. Its totient is φ = 177429600.

The previous prime is 189161573. The next prime is 189161593. The reversal of 189161587 is 785161981.

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

It is not a de Polignac number, because 189161587 - 2⁷ = 189161459 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (189161527) 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 7 ways as a sum of consecutive naturals, for example, 47368 + ... + 51205.

It is an arithmetic number, because the mean of its divisors is an integer number (25136370).

Almost surely, 2^189161587 is an apocalyptic number.

189161587 is a deficient number, since it is larger than the sum of its proper divisors (11929373).

189161587 is a wasteful number, since it uses less digits than its factorization.

189161587 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 98693.

The product of its digits is 120960, while the sum is 46.

The square root of 189161587 is about 13753.6026916586. The cubic root of 189161587 is about 574.0428557642.

It can be divided in two parts, 18916 and 1587, that added together give a triangular number (20503 = T₂₀₂).

The spelling of 189161587 in words is "one hundred eighty-nine million, one hundred sixty-one thousand, five hundred eighty-seven".