44138581 has 2 divisors, whose sum is σ = 44138582. Its totient is φ = 44138580.

The previous prime is 44138557. The next prime is 44138603. The reversal of 44138581 is 18583144.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 31472100 + 12666481 = 5610^2 + 3559^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-44138581 is a prime.

It is a super-2 number, since 2×44138581² = 3896428665387122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (44136581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 22069290 + 22069291.

It is an arithmetic number, because the mean of its divisors is an integer number (22069291).

Almost surely, 2^44138581 is an apocalyptic number.

It is an amenable number.

44138581 is a deficient number, since it is larger than the sum of its proper divisors (1).

44138581 is an equidigital number, since it uses as much as digits as its factorization.

44138581 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15360, while the sum is 34.

The square root of 44138581 is about 6643.6873045019. The cubic root of 44138581 is about 353.4050808574.

The spelling of 44138581 in words is "forty-four million, one hundred thirty-eight thousand, five hundred eighty-one".