31561313323 has 2 divisors, whose sum is σ = 31561313324. Its totient is φ = 31561313322.

The previous prime is 31561313309. The next prime is 31561313327. The reversal of 31561313323 is 32331316513.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 31561313323 - 2¹⁷ = 31561182251 is a prime.

It is a super-2 number, since 2×31561313323² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (31561313327) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15780656661 + 15780656662.

It is an arithmetic number, because the mean of its divisors is an integer number (15780656662).

Almost surely, 2^31561313323 is an apocalyptic number.

31561313323 is a deficient number, since it is larger than the sum of its proper divisors (1).

31561313323 is an equidigital number, since it uses as much as digits as its factorization.

31561313323 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 14580, while the sum is 31.

Adding to 31561313323 its reverse (32331316513), we get a palindrome (63892629836).

The spelling of 31561313323 in words is "thirty-one billion, five hundred sixty-one million, three hundred thirteen thousand, three hundred twenty-three".