31628566649 has 2 divisors, whose sum is σ = 31628566650. Its totient is φ = 31628566648.

The previous prime is 31628566601. The next prime is 31628566681. The reversal of 31628566649 is 94666582613.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 27984271225 + 3644295424 = 167285^2 + 60368^2 .

It is an emirp because it is prime and its reverse (94666582613) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31628566649 - 2²⁰ = 31627518073 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 31628566594 and 31628566603.

It is not a weakly prime, because it can be changed into another prime (31628566349) 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, 15814283324 + 15814283325.

It is an arithmetic number, because the mean of its divisors is an integer number (15814283325).

Almost surely, 2^31628566649 is an apocalyptic number.

It is an amenable number.

31628566649 is a deficient number, since it is larger than the sum of its proper divisors (1).

31628566649 is an equidigital number, since it uses as much as digits as its factorization.

31628566649 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 11197440, while the sum is 56.

The spelling of 31628566649 in words is "thirty-one billion, six hundred twenty-eight million, five hundred sixty-six thousand, six hundred forty-nine".