181071161 has 8 divisors (see below), whose sum is σ = 186394824. Its totient is φ = 175818240.

The previous prime is 181071103. The next prime is 181071173. The reversal of 181071161 is 161170181.

It can be written as a sum of positive squares in 4 ways, for example, as 82446400 + 98624761 = 9080^2 + 9931^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 181071161 - 2¹⁰ = 181070137 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 181071161.

It is not an unprimeable number, because it can be changed into a prime (181071181) 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, 12470 + ... + 22751.

It is an arithmetic number, because the mean of its divisors is an integer number (23299353).

Almost surely, 2^181071161 is an apocalyptic number.

It is an amenable number.

181071161 is a deficient number, since it is larger than the sum of its proper divisors (5323663).

181071161 is an equidigital number, since it uses as much as digits as its factorization.

181071161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35371.

The product of its (nonzero) digits is 336, while the sum is 26.

The square root of 181071161 is about 13456.2684649200. The cubic root of 181071161 is about 565.7394041901.

The spelling of 181071161 in words is "one hundred eighty-one million, seventy-one thousand, one hundred sixty-one".