31320442243 has 16 divisors (see below), whose sum is σ = 32499302400. Its totient is φ = 30160706400.

The previous prime is 31320442217. The next prime is 31320442259. The reversal of 31320442243 is 34224402313.

It is a cyclic number.

It is not a de Polignac number, because 31320442243 - 2²⁹ = 30783571331 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31320442843) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1395198 + ... + 1417468.

It is an arithmetic number, because the mean of its divisors is an integer number (2031206400).

Almost surely, 2^31320442243 is an apocalyptic number.

31320442243 is a deficient number, since it is larger than the sum of its proper divisors (1178860157).

31320442243 is a wasteful number, since it uses less digits than its factorization.

31320442243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22698.

The product of its (nonzero) digits is 13824, while the sum is 28.

Adding to 31320442243 its reverse (34224402313), we get a palindrome (65544844556).

The spelling of 31320442243 in words is "thirty-one billion, three hundred twenty million, four hundred forty-two thousand, two hundred forty-three".