31003221131 has 2 divisors, whose sum is σ = 31003221132. Its totient is φ = 31003221130.

The previous prime is 31003221083. The next prime is 31003221133. The reversal of 31003221131 is 13112230013.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31003221131 is a prime.

It is a super-2 number, since 2×31003221131² (a number of 22 digits) contains 22 as substring.

Together with 31003221133, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (31003221133) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15501610565 + 15501610566.

It is an arithmetic number, because the mean of its divisors is an integer number (15501610566).

Almost surely, 2^31003221131 is an apocalyptic number.

31003221131 is a deficient number, since it is larger than the sum of its proper divisors (1).

31003221131 is an equidigital number, since it uses as much as digits as its factorization.

31003221131 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 108, while the sum is 17.

Adding to 31003221131 its reverse (13112230013), we get a palindrome (44115451144).

The spelling of 31003221131 in words is "thirty-one billion, three million, two hundred twenty-one thousand, one hundred thirty-one".