31026204506161 has 2 divisors, whose sum is σ = 31026204506162. Its totient is φ = 31026204506160.

The previous prime is 31026204506159. The next prime is 31026204506173. The reversal of 31026204506161 is 16160540262013.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 29763233113761 + 1262971392400 = 5455569^2 + 1123820^2 .

It is a cyclic number.

It is not a de Polignac number, because 31026204506161 - 2¹ = 31026204506159 is a prime.

Together with 31026204506159, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 31026204506161.

It is not a weakly prime, because it can be changed into another prime (31026204506191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15513102253080 + 15513102253081.

It is an arithmetic number, because the mean of its divisors is an integer number (15513102253081).

Almost surely, 2^{31026204506161} is an apocalyptic number.

It is an amenable number.

31026204506161 is a deficient number, since it is larger than the sum of its proper divisors (1).

31026204506161 is an equidigital number, since it uses as much as digits as its factorization.

31026204506161 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 51840, while the sum is 37.

Adding to 31026204506161 its reverse (16160540262013), we get a palindrome (47186744768174).

The spelling of 31026204506161 in words is "thirty-one trillion, twenty-six billion, two hundred four million, five hundred six thousand, one hundred sixty-one".