31243223113 has 4 divisors (see below), whose sum is σ = 31243585408. Its totient is φ = 31242860820.

The previous prime is 31243223087. The next prime is 31243223131. The reversal of 31243223113 is 31132234213.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 31243223113 - 2⁹ = 31243222601 is a prime.

It is a super-2 number, since 2×31243223113² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31243223813) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31120 + ... + 251902.

It is an arithmetic number, because the mean of its divisors is an integer number (7810896352).

Almost surely, 2^31243223113 is an apocalyptic number.

It is an amenable number.

31243223113 is a deficient number, since it is larger than the sum of its proper divisors (362295).

31243223113 is a wasteful number, since it uses less digits than its factorization.

31243223113 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 362294.

The product of its digits is 2592, while the sum is 25.

Adding to 31243223113 its reverse (31132234213), we get a palindrome (62375457326).

The spelling of 31243223113 in words is "thirty-one billion, two hundred forty-three million, two hundred twenty-three thousand, one hundred thirteen".