181020169 has 8 divisors (see below), whose sum is σ = 202814208. Its totient is φ = 160115760.

The previous prime is 181020157. The next prime is 181020173. The reversal of 181020169 is 961020181.

It is a happy number.

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 181020169 - 2⁷ = 181020041 is a prime.

It is a super-2 number, since 2×181020169² = 65536603169577122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (181020569) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 221977 + ... + 222790.

It is an arithmetic number, because the mean of its divisors is an integer number (25351776).

Almost surely, 2^181020169 is an apocalyptic number.

It is an amenable number.

181020169 is a deficient number, since it is larger than the sum of its proper divisors (21794039).

181020169 is a wasteful number, since it uses less digits than its factorization.

181020169 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 444815.

The product of its (nonzero) digits is 864, while the sum is 28.

The square root of 181020169 is about 13454.3736011752. The cubic root of 181020169 is about 565.6862926732.

The spelling of 181020169 in words is "one hundred eighty-one million, twenty thousand, one hundred sixty-nine".