31113331243 has 4 divisors (see below), whose sum is σ = 31551547248. Its totient is φ = 30675115240.

The previous prime is 31113331219. The next prime is 31113331253. The reversal of 31113331243 is 34213331113.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31113331243 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31113331253) 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, 219107896 + ... + 219108037.

It is an arithmetic number, because the mean of its divisors is an integer number (7887886812).

Almost surely, 2^31113331243 is an apocalyptic number.

31113331243 is a deficient number, since it is larger than the sum of its proper divisors (438216005).

31113331243 is an equidigital number, since it uses as much as digits as its factorization.

31113331243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 438216004.

The product of its digits is 1944, while the sum is 25.

Adding to 31113331243 its reverse (34213331113), we get a palindrome (65326662356).

The spelling of 31113331243 in words is "thirty-one billion, one hundred thirteen million, three hundred thirty-one thousand, two hundred forty-three".