31311131 has 2 divisors, whose sum is σ = 31311132. Its totient is φ = 31311130.

The previous prime is 31311121. The next prime is 31311143. The reversal of 31311131 is 13111313.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31311131 is a prime.

It is a super-2 number, since 2×31311131² = 1960773848998322, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (31311101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15655565 + 15655566.

It is an arithmetic number, because the mean of its divisors is an integer number (15655566).

Almost surely, 2^31311131 is an apocalyptic number.

31311131 is a deficient number, since it is larger than the sum of its proper divisors (1).

31311131 is an equidigital number, since it uses as much as digits as its factorization.

31311131 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 27, while the sum is 14.

The square root of 31311131 is about 5595.6349952441. The cubic root of 31311131 is about 315.1855159833.

Adding to 31311131 its reverse (13111313), we get a palindrome (44422444).

It can be divided in two parts, 3 and 1311131, that multiplied together give a palindrome (3933393).

The spelling of 31311131 in words is "thirty-one million, three hundred eleven thousand, one hundred thirty-one".