131213103020261 has 2 divisors, whose sum is σ = 131213103020262. Its totient is φ = 131213103020260.

The previous prime is 131213103020161. The next prime is 131213103020299. The reversal of 131213103020261 is 162020301312131.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 100759315955236 + 30453787065025 = 10037894^2 + 5518495^2 .

It is an emirp because it is prime and its reverse (162020301312131) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-131213103020261 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 131213103020261.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (131213103020161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65606551510130 + 65606551510131.

It is an arithmetic number, because the mean of its divisors is an integer number (65606551510131).

Almost surely, 2^{131213103020261} is an apocalyptic number.

It is an amenable number.

131213103020261 is a deficient number, since it is larger than the sum of its proper divisors (1).

131213103020261 is an equidigital number, since it uses as much as digits as its factorization.

131213103020261 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1296, while the sum is 26.

Adding to 131213103020261 its reverse (162020301312131), we get a palindrome (293233404332392).

The spelling of 131213103020261 in words is "one hundred thirty-one trillion, two hundred thirteen billion, one hundred three million, twenty thousand, two hundred sixty-one".