189173681 has 4 divisors (see below), whose sum is σ = 189673200. Its totient is φ = 188674164.

The previous prime is 189173669. The next prime is 189173693. The reversal of 189173681 is 186371981.

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, and also an emirpimes, since its reverse is a distinct semiprime: 186371981 = 79 ⋅2359139.

It is an interprime number because it is at equal distance from previous prime (189173669) and next prime (189173693).

It is a cyclic number.

It is not a de Polignac number, because 189173681 - 2⁶ = 189173617 is a prime.

It is a super-2 number, since 2×189173681² = 71573363166179522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (189173081) 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, 249191 + ... + 249948.

It is an arithmetic number, because the mean of its divisors is an integer number (47418300).

Almost surely, 2^189173681 is an apocalyptic number.

It is an amenable number.

189173681 is a deficient number, since it is larger than the sum of its proper divisors (499519).

189173681 is an equidigital number, since it uses as much as digits as its factorization.

189173681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 499518.

The product of its digits is 72576, while the sum is 44.

The square root of 189173681 is about 13754.0423512508. The cubic root of 189173681 is about 574.0550892669.

The spelling of 189173681 in words is "one hundred eighty-nine million, one hundred seventy-three thousand, six hundred eighty-one".