12617881 has 4 divisors (see below), whose sum is σ = 13282000. Its totient is φ = 11953764.

The previous prime is 12617879. The next prime is 12617887. The reversal of 12617881 is 18871621.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 18871621 = 701 ⋅26921.

It is a cyclic number.

It is not a de Polignac number, because 12617881 - 2¹ = 12617879 is a prime.

It is a super-2 number, since 2×12617881² = 318421841860322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12617887) 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, 332031 + ... + 332068.

It is an arithmetic number, because the mean of its divisors is an integer number (3320500).

Almost surely, 2^12617881 is an apocalyptic number.

It is an amenable number.

12617881 is a deficient number, since it is larger than the sum of its proper divisors (664119).

12617881 is an equidigital number, since it uses as much as digits as its factorization.

12617881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 664118.

The product of its digits is 5376, while the sum is 34.

The square root of 12617881 is about 3552.1656774424. The cubic root of 12617881 is about 232.8067004936.

The spelling of 12617881 in words is "twelve million, six hundred seventeen thousand, eight hundred eighty-one".