129916535 has 16 divisors (see below), whose sum is σ = 185918976. Its totient is φ = 85211808.

The previous prime is 129916531. The next prime is 129916537. The reversal of 129916535 is 535619921.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 129916535 - 2² = 129916531 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 129916492 and 129916501.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129916531) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 79889 + ... + 81498.

It is an arithmetic number, because the mean of its divisors is an integer number (11619936).

Almost surely, 2^129916535 is an apocalyptic number.

129916535 is a deficient number, since it is larger than the sum of its proper divisors (56002441).

129916535 is a wasteful number, since it uses less digits than its factorization.

129916535 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 161422.

The product of its digits is 72900, while the sum is 41.

The square root of 129916535 is about 11398.0934809292. The cubic root of 129916535 is about 506.4712641489.

The spelling of 129916535 in words is "one hundred twenty-nine million, nine hundred sixteen thousand, five hundred thirty-five".