44909814581 has 2 divisors, whose sum is σ = 44909814582. Its totient is φ = 44909814580.

The previous prime is 44909814577. The next prime is 44909814701. The reversal of 44909814581 is 18541890944.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 24387819556 + 20521995025 = 156166^2 + 143255^2 .

It is a cyclic number.

It is not a de Polignac number, because 44909814581 - 2² = 44909814577 is a prime.

It is a super-2 number, since 2×44909814581² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (44909814511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 22454907290 + 22454907291.

It is an arithmetic number, because the mean of its divisors is an integer number (22454907291).

Almost surely, 2^44909814581 is an apocalyptic number.

It is an amenable number.

44909814581 is a deficient number, since it is larger than the sum of its proper divisors (1).

44909814581 is an equidigital number, since it uses as much as digits as its factorization.

44909814581 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1658880, while the sum is 53.

The spelling of 44909814581 in words is "forty-four billion, nine hundred nine million, eight hundred fourteen thousand, five hundred eighty-one".