205687131239 has 2 divisors, whose sum is σ = 205687131240. Its totient is φ = 205687131238.

The previous prime is 205687131229. The next prime is 205687131313. The reversal of 205687131239 is 932131786502.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 205687131239 - 2³⁶ = 136967654503 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 205687131193 and 205687131202.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (205687131229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102843565619 + 102843565620.

It is an arithmetic number, because the mean of its divisors is an integer number (102843565620).

Almost surely, 2^205687131239 is an apocalyptic number.

205687131239 is a deficient number, since it is larger than the sum of its proper divisors (1).

205687131239 is an equidigital number, since it uses as much as digits as its factorization.

205687131239 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 544320, while the sum is 47.

The spelling of 205687131239 in words is "two hundred five billion, six hundred eighty-seven million, one hundred thirty-one thousand, two hundred thirty-nine".