129461617 has 4 divisors (see below), whose sum is σ = 129484516. Its totient is φ = 129438720.

The previous prime is 129461603. The next prime is 129461623. The reversal of 129461617 is 716164921.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 716164921 = 18217 ⋅39313.

It can be written as a sum of positive squares in 2 ways, for example, as 100721296 + 28740321 = 10036^2 + 5361^2 .

It is a cyclic number.

It is not a de Polignac number, because 129461617 - 2⁷ = 129461489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (129461677) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3817 + ... + 16537.

It is an arithmetic number, because the mean of its divisors is an integer number (32371129).

It is a Poulet number, since it divides 2^129461616-1.

Almost surely, 2^129461617 is an apocalyptic number.

It is an amenable number.

129461617 is a deficient number, since it is larger than the sum of its proper divisors (22899).

129461617 is a wasteful number, since it uses less digits than its factorization.

129461617 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22898.

The product of its digits is 18144, while the sum is 37.

The square root of 129461617 is about 11378.1200995595. The cubic root of 129461617 is about 505.8794166048.

The spelling of 129461617 in words is "one hundred twenty-nine million, four hundred sixty-one thousand, six hundred seventeen".