181285946 has 4 divisors (see below), whose sum is σ = 271928922. Its totient is φ = 90642972.

The previous prime is 181285879. The next prime is 181285957. The reversal of 181285946 is 649582181.

181285946 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 649582181 = 4561 ⋅142421.

It can be written as a sum of positive squares in only one way, i.e., 147355321 + 33930625 = 12139^2 + 5825^2 .

It is a super-2 number, since 2×181285946² = 65729188434229832, which contains 22 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 181285897 and 181285906.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45321485 + ... + 45321488.

Almost surely, 2^181285946 is an apocalyptic number.

181285946 is a deficient number, since it is larger than the sum of its proper divisors (90642976).

181285946 is an equidigital number, since it uses as much as digits as its factorization.

181285946 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90642975.

The product of its digits is 138240, while the sum is 44.

The square root of 181285946 is about 13464.2469525778. The cubic root of 181285946 is about 565.9630074838.

The spelling of 181285946 in words is "one hundred eighty-one million, two hundred eighty-five thousand, nine hundred forty-six".