12616391 has 4 divisors (see below), whose sum is σ = 12638472. Its totient is φ = 12594312.

The previous prime is 12616339. The next prime is 12616427. The reversal of 12616391 is 19361621.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19361621 = 1619 ⋅11959.

It is a cyclic number.

It is not a de Polignac number, because 12616391 - 2⁶ = 12616327 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12615391) 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, 10160 + ... + 11333.

It is an arithmetic number, because the mean of its divisors is an integer number (3159618).

Almost surely, 2^12616391 is an apocalyptic number.

12616391 is a deficient number, since it is larger than the sum of its proper divisors (22081).

12616391 is an equidigital number, since it uses as much as digits as its factorization.

12616391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22080.

The product of its digits is 1944, while the sum is 29.

The square root of 12616391 is about 3551.9559400420. The cubic root of 12616391 is about 232.7975363654.

The spelling of 12616391 in words is "twelve million, six hundred sixteen thousand, three hundred ninety-one".