440097661 has 2 divisors, whose sum is σ = 440097662. Its totient is φ = 440097660.

The previous prime is 440097659. The next prime is 440097667. The reversal of 440097661 is 166790044.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 422508025 + 17589636 = 20555^2 + 4194^2 .

It is a cyclic number.

It is not a de Polignac number, because 440097661 - 2¹ = 440097659 is a prime.

Together with 440097659, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 440097661.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (440097667) 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, 220048830 + 220048831.

It is an arithmetic number, because the mean of its divisors is an integer number (220048831).

Almost surely, 2^440097661 is an apocalyptic number.

It is an amenable number.

440097661 is a deficient number, since it is larger than the sum of its proper divisors (1).

440097661 is an equidigital number, since it uses as much as digits as its factorization.

440097661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36288, while the sum is 37.

The square root of 440097661 is about 20978.5047369921. The cubic root of 440097661 is about 760.6467607379.

The spelling of 440097661 in words is "four hundred forty million, ninety-seven thousand, six hundred sixty-one".