129787647061 has 2 divisors, whose sum is σ = 129787647062. Its totient is φ = 129787647060.

The previous prime is 129787647019. The next prime is 129787647203. The reversal of 129787647061 is 160746787921.

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., 125028716836 + 4758930225 = 353594^2 + 68985^2 .

It is a cyclic number.

It is not a de Polignac number, because 129787647061 - 2¹⁵ = 129787614293 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 129787646987 and 129787647005.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (129787647001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64893823530 + 64893823531.

It is an arithmetic number, because the mean of its divisors is an integer number (64893823531).

Almost surely, 2^129787647061 is an apocalyptic number.

It is an amenable number.

129787647061 is a deficient number, since it is larger than the sum of its proper divisors (1).

129787647061 is an equidigital number, since it uses as much as digits as its factorization.

129787647061 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7112448, while the sum is 58.

The spelling of 129787647061 in words is "one hundred twenty-nine billion, seven hundred eighty-seven million, six hundred forty-seven thousand, sixty-one".