131515260109 has 2 divisors, whose sum is σ = 131515260110. Its totient is φ = 131515260108.

The previous prime is 131515260089. The next prime is 131515260113. The reversal of 131515260109 is 901062515131.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 90459585225 + 41055674884 = 300765^2 + 202622^2 .

It is an emirp because it is prime and its reverse (901062515131) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 131515260109 - 2⁵ = 131515260077 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (131515260139) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65757630054 + 65757630055.

It is an arithmetic number, because the mean of its divisors is an integer number (65757630055).

Almost surely, 2^131515260109 is an apocalyptic number.

It is an amenable number.

131515260109 is a deficient number, since it is larger than the sum of its proper divisors (1).

131515260109 is an equidigital number, since it uses as much as digits as its factorization.

131515260109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8100, while the sum is 34.

The spelling of 131515260109 in words is "one hundred thirty-one billion, five hundred fifteen million, two hundred sixty thousand, one hundred nine".