129131081517 has 32 divisors (see below), whose sum is σ = 175920408576. Its totient is φ = 84235233600.

The previous prime is 129131081491. The next prime is 129131081531. The reversal of 129131081517 is 715180131921.

It is not a de Polignac number, because 129131081517 - 2¹² = 129131077421 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129131081537) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 16759888 + ... + 16767590.

It is an arithmetic number, because the mean of its divisors is an integer number (5497512768).

Almost surely, 2^129131081517 is an apocalyptic number.

It is an amenable number.

129131081517 is a deficient number, since it is larger than the sum of its proper divisors (46789327059).

129131081517 is a wasteful number, since it uses less digits than its factorization.

129131081517 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8361.

The product of its (nonzero) digits is 15120, while the sum is 39.

The spelling of 129131081517 in words is "one hundred twenty-nine billion, one hundred thirty-one million, eighty-one thousand, five hundred seventeen".