31222316605 has 4 divisors (see below), whose sum is σ = 37466779932. Its totient is φ = 24977853280.

The previous prime is 31222316579. The next prime is 31222316627. The reversal of 31222316605 is 50661322213.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 50661322213 = 3559 ⋅14234707.

It can be written as a sum of positive squares in 2 ways, for example, as 24379387321 + 6842929284 = 156139^2 + 82722^2 .

It is not a de Polignac number, because 31222316605 - 2¹³ = 31222308413 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3122231656 + ... + 3122231665.

It is an arithmetic number, because the mean of its divisors is an integer number (9366694983).

Almost surely, 2^31222316605 is an apocalyptic number.

It is an amenable number.

31222316605 is a deficient number, since it is larger than the sum of its proper divisors (6244463327).

31222316605 is an equidigital number, since it uses as much as digits as its factorization.

31222316605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6244463326.

The product of its (nonzero) digits is 12960, while the sum is 31.

Adding to 31222316605 its reverse (50661322213), we get a palindrome (81883638818).

The spelling of 31222316605 in words is "thirty-one billion, two hundred twenty-two million, three hundred sixteen thousand, six hundred five".