44251681 has 2 divisors, whose sum is σ = 44251682. Its totient is φ = 44251680.

The previous prime is 44251643. The next prime is 44251717. The reversal of 44251681 is 18615244.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 24750625 + 19501056 = 4975^2 + 4416^2 .

It is a cyclic number.

It is not a de Polignac number, because 44251681 - 2¹¹ = 44249633 is a prime.

It is a super-2 number, since 2×44251681² = 3916422542651522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (44251621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 22125840 + 22125841.

It is an arithmetic number, because the mean of its divisors is an integer number (22125841).

Almost surely, 2^44251681 is an apocalyptic number.

It is an amenable number.

44251681 is a deficient number, since it is larger than the sum of its proper divisors (1).

44251681 is an equidigital number, since it uses as much as digits as its factorization.

44251681 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7680, while the sum is 31.

The square root of 44251681 is about 6652.1936983224. The cubic root of 44251681 is about 353.7066765942.

The spelling of 44251681 in words is "forty-four million, two hundred fifty-one thousand, six hundred eighty-one".