129749684291 has 4 divisors (see below), whose sum is σ = 130192516272. Its totient is φ = 129306852312.

The previous prime is 129749684287. The next prime is 129749684321. The reversal of 129749684291 is 192486947921.

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

It is a cyclic number.

It is not a de Polignac number, because 129749684291 - 2² = 129749684287 is a prime.

It is a super-2 number, since 2×129749684291² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (129749683291) 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, 221415551 + ... + 221416136.

It is an arithmetic number, because the mean of its divisors is an integer number (32548129068).

Almost surely, 2^129749684291 is an apocalyptic number.

129749684291 is a deficient number, since it is larger than the sum of its proper divisors (442831981).

129749684291 is an equidigital number, since it uses as much as digits as its factorization.

129749684291 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 442831980.

The product of its digits is 15676416, while the sum is 62.

The spelling of 129749684291 in words is "one hundred twenty-nine billion, seven hundred forty-nine million, six hundred eighty-four thousand, two hundred ninety-one".