129725617213 has 4 divisors (see below), whose sum is σ = 129735846940. Its totient is φ = 129715387488.

The previous prime is 129725617141. The next prime is 129725617223. The reversal of 129725617213 is 312716527921.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 14795803044 + 114929814169 = 121638^2 + 339013^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-129725617213 is a prime.

It is a super-2 number, since 2×129725617213² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129725617223) 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, 5095818 + ... + 5121211.

It is an arithmetic number, because the mean of its divisors is an integer number (32433961735).

Almost surely, 2^129725617213 is an apocalyptic number.

It is an amenable number.

129725617213 is a deficient number, since it is larger than the sum of its proper divisors (10229727).

129725617213 is a wasteful number, since it uses less digits than its factorization.

129725617213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10229726.

The product of its digits is 317520, while the sum is 46.

The spelling of 129725617213 in words is "one hundred twenty-nine billion, seven hundred twenty-five million, six hundred seventeen thousand, two hundred thirteen".