44640913 has 2 divisors, whose sum is σ = 44640914. Its totient is φ = 44640912.

The previous prime is 44640901. The next prime is 44640931. The reversal of 44640913 is 31904644.

Together with next prime (44640931) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 42601729 + 2039184 = 6527^2 + 1428^2 .

It is a cyclic number.

It is not a de Polignac number, because 44640913 - 2¹⁷ = 44509841 is a prime.

It is a super-2 number, since 2×44640913² = 3985622226947138, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (44640943) 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, 22320456 + 22320457.

It is an arithmetic number, because the mean of its divisors is an integer number (22320457).

Almost surely, 2^44640913 is an apocalyptic number.

It is an amenable number.

44640913 is a deficient number, since it is larger than the sum of its proper divisors (1).

44640913 is an equidigital number, since it uses as much as digits as its factorization.

44640913 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10368, while the sum is 31.

The square root of 44640913 is about 6681.3855598970. The cubic root of 44640913 is about 354.7407033324.

The spelling of 44640913 in words is "forty-four million, six hundred forty thousand, nine hundred thirteen".