189561761 has 4 divisors (see below), whose sum is σ = 193138452. Its totient is φ = 185985072.

The previous prime is 189561751. The next prime is 189561769. The reversal of 189561761 is 167165981.

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

It can be written as a sum of positive squares in 2 ways, for example, as 146410000 + 43151761 = 12100^2 + 6569^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-189561761 is a prime.

It is a super-2 number, since 2×189561761² = 71867322466842242, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (189561769) 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, 1788266 + ... + 1788371.

It is an arithmetic number, because the mean of its divisors is an integer number (48284613).

Almost surely, 2^189561761 is an apocalyptic number.

It is an amenable number.

189561761 is a deficient number, since it is larger than the sum of its proper divisors (3576691).

189561761 is an equidigital number, since it uses as much as digits as its factorization.

189561761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3576690.

The product of its digits is 90720, while the sum is 44.

The square root of 189561761 is about 13768.1429757248. The cubic root of 189561761 is about 574.4473692274.

The spelling of 189561761 in words is "one hundred eighty-nine million, five hundred sixty-one thousand, seven hundred sixty-one".