31313220443 has 2 divisors, whose sum is σ = 31313220444. Its totient is φ = 31313220442.

The previous prime is 31313220401. The next prime is 31313220473. The reversal of 31313220443 is 34402231313.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 31313220443 - 2¹⁴ = 31313204059 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (31313220473) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15656610221 + 15656610222.

It is an arithmetic number, because the mean of its divisors is an integer number (15656610222).

Almost surely, 2^31313220443 is an apocalyptic number.

31313220443 is a deficient number, since it is larger than the sum of its proper divisors (1).

31313220443 is an equidigital number, since it uses as much as digits as its factorization.

31313220443 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5184, while the sum is 26.

Adding to 31313220443 its reverse (34402231313), we get a palindrome (65715451756).

The spelling of 31313220443 in words is "thirty-one billion, three hundred thirteen million, two hundred twenty thousand, four hundred forty-three".