31303220243 has 4 divisors (see below), whose sum is σ = 31465413288. Its totient is φ = 31141027200.

The previous prime is 31303220239. The next prime is 31303220251. The reversal of 31303220243 is 34202230313.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 31303220243 - 2² = 31303220239 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31303220203) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 81096233 + ... + 81096618.

It is an arithmetic number, because the mean of its divisors is an integer number (7866353322).

Almost surely, 2^31303220243 is an apocalyptic number.

31303220243 is a deficient number, since it is larger than the sum of its proper divisors (162193045).

31303220243 is a wasteful number, since it uses less digits than its factorization.

31303220243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 162193044.

The product of its (nonzero) digits is 2592, while the sum is 23.

Adding to 31303220243 its reverse (34202230313), we get a palindrome (65505450556).

The spelling of 31303220243 in words is "thirty-one billion, three hundred three million, two hundred twenty thousand, two hundred forty-three".