189941761 has 8 divisors (see below), whose sum is σ = 191143944. Its totient is φ = 188743680.

The previous prime is 189941749. The next prime is 189941767. The reversal of 189941761 is 167149981.

It can be written as a sum of positive squares in 4 ways, for example, as 152670736 + 37271025 = 12356^2 + 6105^2 .

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

It is a 2-Lehmer number, since φ(189941761) divides (189941761-1)².

It is a cyclic number.

It is a Carmichael number.

It is not a de Polignac number, because 189941761 - 2⁵ = 189941729 is a prime.

It is a super-2 number, since 2×189941761² = 72155745143562242, which contains 22 as substring.

It is a deceptive number, since it divides R_189941760.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (189941767) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 164161 + ... + 165313.

It is an arithmetic number, because the mean of its divisors is an integer number (23892993).

It is a Poulet number, since it divides 2^189941760-1.

Almost surely, 2^189941761 is an apocalyptic number.

It is an amenable number.

189941761 is a deficient number, since it is larger than the sum of its proper divisors (1202183).

189941761 is a wasteful number, since it uses less digits than its factorization.

189941761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2051.

The product of its digits is 108864, while the sum is 46.

The square root of 189941761 is about 13781.9360396136. The cubic root of 189941761 is about 574.8309632925.

It can be divided in two parts, 1899 and 41761, that added together give a triangular number (43660 = T₂₉₅).

The spelling of 189941761 in words is "one hundred eighty-nine million, nine hundred forty-one thousand, seven hundred sixty-one".