31313442163 has 2 divisors, whose sum is σ = 31313442164. Its totient is φ = 31313442162.

The previous prime is 31313442109. The next prime is 31313442169. The reversal of 31313442163 is 36124431313.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 31313442163 - 2³³ = 22723507571 is a prime.

It is a super-2 number, since 2×31313442163² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (31313442169) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15656721081 + 15656721082.

It is an arithmetic number, because the mean of its divisors is an integer number (15656721082).

Almost surely, 2^31313442163 is an apocalyptic number.

31313442163 is a deficient number, since it is larger than the sum of its proper divisors (1).

31313442163 is an equidigital number, since it uses as much as digits as its factorization.

31313442163 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15552, while the sum is 31.

Adding to 31313442163 its reverse (36124431313), we get a palindrome (67437873476).

The spelling of 31313442163 in words is "thirty-one billion, three hundred thirteen million, four hundred forty-two thousand, one hundred sixty-three".