189137561 has 4 divisors (see below), whose sum is σ = 190973952. Its totient is φ = 187301172.

The previous prime is 189137537. The next prime is 189137567. The reversal of 189137561 is 165731981.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 189137561 - 2¹⁰ = 189136537 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (189137567) 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 3 ways as a sum of consecutive naturals, for example, 918041 + ... + 918246.

It is an arithmetic number, because the mean of its divisors is an integer number (47743488).

Almost surely, 2^189137561 is an apocalyptic number.

It is an amenable number.

189137561 is a deficient number, since it is larger than the sum of its proper divisors (1836391).

189137561 is a wasteful number, since it uses less digits than its factorization.

189137561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1836390.

The product of its digits is 45360, while the sum is 41.

The square root of 189137561 is about 13752.7292200494. The cubic root of 189137561 is about 574.0185510805.

The spelling of 189137561 in words is "one hundred eighty-nine million, one hundred thirty-seven thousand, five hundred sixty-one".