31120211243 has 4 divisors (see below), whose sum is σ = 33949321368. Its totient is φ = 28291101120.

The previous prime is 31120211209. The next prime is 31120211279. The reversal of 31120211243 is 34211202113.

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-31120211243 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31120210243) 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, 1414555046 + ... + 1414555067.

It is an arithmetic number, because the mean of its divisors is an integer number (8487330342).

Almost surely, 2^31120211243 is an apocalyptic number.

31120211243 is a deficient number, since it is larger than the sum of its proper divisors (2829110125).

31120211243 is a wasteful number, since it uses less digits than its factorization.

31120211243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2829110124.

The product of its (nonzero) digits is 288, while the sum is 20.

Adding to 31120211243 its reverse (34211202113), we get a palindrome (65331413356).

The spelling of 31120211243 in words is "thirty-one billion, one hundred twenty million, two hundred eleven thousand, two hundred forty-three".