31606513031 has 2 divisors, whose sum is σ = 31606513032. Its totient is φ = 31606513030.

The previous prime is 31606513013. The next prime is 31606513079. The reversal of 31606513031 is 13031560613.

Together with previous prime (31606513013) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31606513031 is a prime.

It is a super-2 number, since 2×31606513031² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 31606512985 and 31606513003.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31606513331) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15803256515 + 15803256516.

It is an arithmetic number, because the mean of its divisors is an integer number (15803256516).

Almost surely, 2^31606513031 is an apocalyptic number.

31606513031 is a deficient number, since it is larger than the sum of its proper divisors (1).

31606513031 is an equidigital number, since it uses as much as digits as its factorization.

31606513031 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4860, while the sum is 29.

The spelling of 31606513031 in words is "thirty-one billion, six hundred six million, five hundred thirteen thousand, thirty-one".