31356450220573 has 2 divisors, whose sum is σ = 31356450220574. Its totient is φ = 31356450220572.

The previous prime is 31356450220499. The next prime is 31356450220577. The reversal of 31356450220573 is 37502205465313.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 23804270197444 + 7552180023129 = 4878962^2 + 2748123^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31356450220573 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31356450220577) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15678225110286 + 15678225110287.

It is an arithmetic number, because the mean of its divisors is an integer number (15678225110287).

Almost surely, 2^{31356450220573} is an apocalyptic number.

It is an amenable number.

31356450220573 is a deficient number, since it is larger than the sum of its proper divisors (1).

31356450220573 is an equidigital number, since it uses as much as digits as its factorization.

31356450220573 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2268000, while the sum is 46.

Adding to 31356450220573 its reverse (37502205465313), we get a palindrome (68858655685886).

The spelling of 31356450220573 in words is "thirty-one trillion, three hundred fifty-six billion, four hundred fifty million, two hundred twenty thousand, five hundred seventy-three".