44158181 has 4 divisors (see below), whose sum is σ = 44182092. Its totient is φ = 44134272.

The previous prime is 44158171. The next prime is 44158187. The reversal of 44158181 is 18185144.

It is a happy number.

44158181 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 35402500 + 8755681 = 5950^2 + 2959^2 .

It is a cyclic number.

It is not a de Polignac number, because 44158181 - 2⁶ = 44158117 is a prime.

It is a super-2 number, since 2×44158181² = 3899889898457522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (44158187) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8930 + ... + 12963.

It is an arithmetic number, because the mean of its divisors is an integer number (11045523).

Almost surely, 2^44158181 is an apocalyptic number.

It is an amenable number.

44158181 is a deficient number, since it is larger than the sum of its proper divisors (23911).

44158181 is a wasteful number, since it uses less digits than its factorization.

44158181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23910.

The product of its digits is 5120, while the sum is 32.

The square root of 44158181 is about 6645.1622252583. The cubic root of 44158181 is about 353.4573836607.

The spelling of 44158181 in words is "forty-four million, one hundred fifty-eight thousand, one hundred eighty-one".