31131323 has 2 divisors, whose sum is σ = 31131324. Its totient is φ = 31131322.

The previous prime is 31131307. The next prime is 31131337. The reversal of 31131323 is 32313113.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 31131323 - 2⁴ = 31131307 is a prime.

It is not a weakly prime, because it can be changed into another prime (31139323) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15565661 + 15565662.

It is an arithmetic number, because the mean of its divisors is an integer number (15565662).

Almost surely, 2^31131323 is an apocalyptic number.

31131323 is a deficient number, since it is larger than the sum of its proper divisors (1).

31131323 is an equidigital number, since it uses as much as digits as its factorization.

31131323 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 162, while the sum is 17.

The square root of 31131323 is about 5579.5450531383. The cubic root of 31131323 is about 314.5810269244.

Adding to 31131323 its reverse (32313113), we get a palindrome (63444436).

The spelling of 31131323 in words is "thirty-one million, one hundred thirty-one thousand, three hundred twenty-three".