12616381 has 4 divisors (see below), whose sum is σ = 12643200. Its totient is φ = 12589564.

The previous prime is 12616339. The next prime is 12616427. The reversal of 12616381 is 18361621.

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: 18361621 = 157 ⋅116953.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12616381 is a prime.

It is a super-2 number, since 2×12616381² = 318346139074322, which 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 (12616181) 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, 12691 + ... + 13648.

It is an arithmetic number, because the mean of its divisors is an integer number (3160800).

Almost surely, 2^12616381 is an apocalyptic number.

It is an amenable number.

12616381 is a deficient number, since it is larger than the sum of its proper divisors (26819).

12616381 is an equidigital number, since it uses as much as digits as its factorization.

12616381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26818.

The product of its digits is 1728, while the sum is 28.

The square root of 12616381 is about 3551.9545323667. The cubic root of 12616381 is about 232.7974748588.

The spelling of 12616381 in words is "twelve million, six hundred sixteen thousand, three hundred eighty-one".