12617029891 has 4 divisors (see below), whose sum is σ = 13165596432. Its totient is φ = 12068463352.

The previous prime is 12617029847. The next prime is 12617029939. The reversal of 12617029891 is 19892071621.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19892071621 = 41491 ⋅479431.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12617029891 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12617029811) 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, 274283236 + ... + 274283281.

It is an arithmetic number, because the mean of its divisors is an integer number (3291399108).

Almost surely, 2^12617029891 is an apocalyptic number.

12617029891 is a deficient number, since it is larger than the sum of its proper divisors (548566541).

12617029891 is an equidigital number, since it uses as much as digits as its factorization.

12617029891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 548566540.

The product of its (nonzero) digits is 108864, while the sum is 46.

The spelling of 12617029891 in words is "twelve billion, six hundred seventeen million, twenty-nine thousand, eight hundred ninety-one".