31133132231 has 2 divisors, whose sum is σ = 31133132232. Its totient is φ = 31133132230.

The previous prime is 31133132203. The next prime is 31133132267. The reversal of 31133132231 is 13223133113.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 31133132231 - 2³⁴ = 13953263047 is a prime.

It is a super-2 number, since 2×31133132231² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 31133132197 and 31133132206.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31133132531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15566566115 + 15566566116.

It is an arithmetic number, because the mean of its divisors is an integer number (15566566116).

Almost surely, 2^31133132231 is an apocalyptic number.

31133132231 is a deficient number, since it is larger than the sum of its proper divisors (1).

31133132231 is an equidigital number, since it uses as much as digits as its factorization.

31133132231 is an evil number, because the sum of its binary digits is even.

The product of its digits is 972, while the sum is 23.

Adding to 31133132231 its reverse (13223133113), we get a palindrome (44356265344).

The spelling of 31133132231 in words is "thirty-one billion, one hundred thirty-three million, one hundred thirty-two thousand, two hundred thirty-one".