31112133011 has 4 divisors (see below), whose sum is σ = 31835671032. Its totient is φ = 30388594992.

The previous prime is 31112133001. The next prime is 31112133083. The reversal of 31112133011 is 11033121113.

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-31112133011 is a prime.

It is a super-2 number, since 2×31112133011² (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 (31112133001) 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, 361768946 + ... + 361769031.

It is an arithmetic number, because the mean of its divisors is an integer number (7958917758).

Almost surely, 2^31112133011 is an apocalyptic number.

31112133011 is a deficient number, since it is larger than the sum of its proper divisors (723538021).

31112133011 is an equidigital number, since it uses as much as digits as its factorization.

31112133011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 723538020.

The product of its (nonzero) digits is 54, while the sum is 17.

Adding to 31112133011 its reverse (11033121113), we get a palindrome (42145254124).

The spelling of 31112133011 in words is "thirty-one billion, one hundred twelve million, one hundred thirty-three thousand, eleven".