131044430261 has 2 divisors, whose sum is σ = 131044430262. Its totient is φ = 131044430260.

The previous prime is 131044430243. The next prime is 131044430287. The reversal of 131044430261 is 162034440131.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 131039656036 + 4774225 = 361994^2 + 2185^2 .

It is a cyclic number.

It is not a de Polignac number, because 131044430261 - 2⁶ = 131044430197 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (131044430201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65522215130 + 65522215131.

It is an arithmetic number, because the mean of its divisors is an integer number (65522215131).

Almost surely, 2^131044430261 is an apocalyptic number.

It is an amenable number.

131044430261 is a deficient number, since it is larger than the sum of its proper divisors (1).

131044430261 is an equidigital number, since it uses as much as digits as its factorization.

131044430261 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6912, while the sum is 29.

Adding to 131044430261 its reverse (162034440131), we get a palindrome (293078870392).

The spelling of 131044430261 in words is "one hundred thirty-one billion, forty-four million, four hundred thirty thousand, two hundred sixty-one".