44412491581 has 2 divisors, whose sum is σ = 44412491582. Its totient is φ = 44412491580.

The previous prime is 44412491561. The next prime is 44412491639. The reversal of 44412491581 is 18519421444.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 44411769081 + 722500 = 210741^2 + 850^2 .

It is a cyclic number.

It is not a de Polignac number, because 44412491581 - 2¹⁹ = 44411967293 is a prime.

It is a super-2 number, since 2×44412491581² (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 (44412491561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 22206245790 + 22206245791.

It is an arithmetic number, because the mean of its divisors is an integer number (22206245791).

Almost surely, 2^44412491581 is an apocalyptic number.

It is an amenable number.

44412491581 is a deficient number, since it is larger than the sum of its proper divisors (1).

44412491581 is an equidigital number, since it uses as much as digits as its factorization.

44412491581 is an evil number, because the sum of its binary digits is even.

The product of its digits is 184320, while the sum is 43.

The spelling of 44412491581 in words is "forty-four billion, four hundred twelve million, four hundred ninety-one thousand, five hundred eighty-one".