31133420231 has 2 divisors, whose sum is σ = 31133420232. Its totient is φ = 31133420230.

The previous prime is 31133420191. The next prime is 31133420239. The reversal of 31133420231 is 13202433113.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 31133420231 - 2⁶ = 31133420167 is a prime.

It is a super-2 number, since 2×31133420231² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 31133420197 and 31133420206.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31133420239) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15566710115 + 15566710116.

It is an arithmetic number, because the mean of its divisors is an integer number (15566710116).

Almost surely, 2^31133420231 is an apocalyptic number.

31133420231 is a deficient number, since it is larger than the sum of its proper divisors (1).

31133420231 is an equidigital number, since it uses as much as digits as its factorization.

31133420231 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1296, while the sum is 23.

Adding to 31133420231 its reverse (13202433113), we get a palindrome (44335853344).

The spelling of 31133420231 in words is "thirty-one billion, one hundred thirty-three million, four hundred twenty thousand, two hundred thirty-one".