44437494581 has 2 divisors, whose sum is σ = 44437494582. Its totient is φ = 44437494580.

The previous prime is 44437494533. The next prime is 44437494593. The reversal of 44437494581 is 18549473444.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 37639492081 + 6798002500 = 194009^2 + 82450^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-44437494581 is a prime.

It is a super-2 number, since 2×44437494581² (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 (44437496581) 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, 22218747290 + 22218747291.

It is an arithmetic number, because the mean of its divisors is an integer number (22218747291).

Almost surely, 2^44437494581 is an apocalyptic number.

It is an amenable number.

44437494581 is a deficient number, since it is larger than the sum of its proper divisors (1).

44437494581 is an equidigital number, since it uses as much as digits as its factorization.

44437494581 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7741440, while the sum is 53.

The spelling of 44437494581 in words is "forty-four billion, four hundred thirty-seven million, four hundred ninety-four thousand, five hundred eighty-one".