131021186858609 has 2 divisors, whose sum is σ = 131021186858610. Its totient is φ = 131021186858608.

The previous prime is 131021186858603. The next prime is 131021186858701. The reversal of 131021186858609 is 906858681120131.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 130320832114225 + 700354744384 = 11415815^2 + 836872^2 .

It is an emirp because it is prime and its reverse (906858681120131) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 131021186858609 - 2⁴ = 131021186858593 is a prime.

It is not a weakly prime, because it can be changed into another prime (131021186858603) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65510593429304 + 65510593429305.

It is an arithmetic number, because the mean of its divisors is an integer number (65510593429305).

Almost surely, 2^{131021186858609} is an apocalyptic number.

It is an amenable number.

131021186858609 is a deficient number, since it is larger than the sum of its proper divisors (1).

131021186858609 is an equidigital number, since it uses as much as digits as its factorization.

131021186858609 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4976640, while the sum is 59.

The spelling of 131021186858609 in words is "one hundred thirty-one trillion, twenty-one billion, one hundred eighty-six million, eight hundred fifty-eight thousand, six hundred nine".