131921572309 has 2 divisors, whose sum is σ = 131921572310. Its totient is φ = 131921572308.

The previous prime is 131921572303. The next prime is 131921572319. The reversal of 131921572309 is 903275129131.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 121397890084 + 10523682225 = 348422^2 + 102585^2 .

It is an emirp because it is prime and its reverse (903275129131) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 131921572309 - 2¹⁷ = 131921441237 is a prime.

It is a super-3 number, since 3×131921572309³ (a number of 34 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (131921572303) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65960786154 + 65960786155.

It is an arithmetic number, because the mean of its divisors is an integer number (65960786155).

Almost surely, 2^131921572309 is an apocalyptic number.

It is an amenable number.

131921572309 is a deficient number, since it is larger than the sum of its proper divisors (1).

131921572309 is an equidigital number, since it uses as much as digits as its factorization.

131921572309 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 102060, while the sum is 43.

The spelling of 131921572309 in words is "one hundred thirty-one billion, nine hundred twenty-one million, five hundred seventy-two thousand, three hundred nine".