161812044 has 36 divisors (see below), whose sum is σ = 409425744. Its totient is φ = 53884512.

The previous prime is 161812031. The next prime is 161812067. The reversal of 161812044 is 440218161.

It is a happy number.

161812044 is a `hidden beast` number, since 1 + 618 + 1 + 2 + 0 + 44 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a junction number, because it is equal to n+sod(n) for n = 161811999 and 161812017.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 56454 + ... + 59250.

Almost surely, 2^161812044 is an apocalyptic number.

It is an amenable number.

161812044 is an abundant number, since it is smaller than the sum of its proper divisors (247613700).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

161812044 is a wasteful number, since it uses less digits than its factorization.

161812044 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4414 (or 4409 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 27.

The square root of 161812044 is about 12720.5363094486. The cubic root of 161812044 is about 544.9252698927.

It can be divided in two parts, 16181 and 2044, that added together give a square (18225 = 135²).

The spelling of 161812044 in words is "one hundred sixty-one million, eight hundred twelve thousand, forty-four".