44002181 has 2 divisors, whose sum is σ = 44002182. Its totient is φ = 44002180.

The previous prime is 44002177. The next prime is 44002229. The reversal of 44002181 is 18120044.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 43890625 + 111556 = 6625^2 + 334^2 .

It is a cyclic number.

It is not a de Polignac number, because 44002181 - 2² = 44002177 is a prime.

It is a super-2 number, since 2×44002181² = 3872383865513522, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (44002781) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 22001090 + 22001091.

It is an arithmetic number, because the mean of its divisors is an integer number (22001091).

Almost surely, 2^44002181 is an apocalyptic number.

It is an amenable number.

44002181 is a deficient number, since it is larger than the sum of its proper divisors (1).

44002181 is an equidigital number, since it uses as much as digits as its factorization.

44002181 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 256, while the sum is 20.

The square root of 44002181 is about 6633.4139777342. The cubic root of 44002181 is about 353.0406665345.

The spelling of 44002181 in words is "forty-four million, two thousand, one hundred eighty-one".