189144539 has 4 divisors (see below), whose sum is σ = 190879920. Its totient is φ = 187409160.

The previous prime is 189144523. The next prime is 189144541. The reversal of 189144539 is 935441981.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 189144539 - 2⁴ = 189144523 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 189144539.

It is not an unprimeable number, because it can be changed into a prime (189144509) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 867527 + ... + 867744.

It is an arithmetic number, because the mean of its divisors is an integer number (47719980).

Almost surely, 2^189144539 is an apocalyptic number.

189144539 is a deficient number, since it is larger than the sum of its proper divisors (1735381).

189144539 is a wasteful number, since it uses less digits than its factorization.

189144539 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1735380.

The product of its digits is 155520, while the sum is 44.

The square root of 189144539 is about 13752.9829128084. The cubic root of 189144539 is about 574.0256102322.

The spelling of 189144539 in words is "one hundred eighty-nine million, one hundred forty-four thousand, five hundred thirty-nine".