966561181 has 4 divisors (see below), whose sum is σ = 989039392. Its totient is φ = 944082972.

The previous prime is 966561161. The next prime is 966561191. The reversal of 966561181 is 181165669.

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: 181165669 = 61 ⋅2969929.

It is a cyclic number.

It is not a de Polignac number, because 966561181 - 2⁹ = 966560669 is a prime.

It is a super-2 number, since 2×966561181² = 1868481033232229522, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (43), and also a Moran number because the ratio is a prime number: 22478167 = 966561181 / (9 + 6 + 6 + 5 + 6 + 1 + 1 + 8 + 1).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (966561151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11239041 + ... + 11239126.

It is an arithmetic number, because the mean of its divisors is an integer number (247259848).

Almost surely, 2^966561181 is an apocalyptic number.

It is an amenable number.

966561181 is a deficient number, since it is larger than the sum of its proper divisors (22478211).

966561181 is a wasteful number, since it uses less digits than its factorization.

966561181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22478210.

The product of its digits is 77760, while the sum is 43.

The square root of 966561181 is about 31089.5670764326. The cubic root of 966561181 is about 988.7271268409.

The spelling of 966561181 in words is "nine hundred sixty-six million, five hundred sixty-one thousand, one hundred eighty-one".