12591616 has 20 divisors (see below), whose sum is σ = 25159662. Its totient is φ = 6295552.

The previous prime is 12591613. The next prime is 12591617. The reversal of 12591616 is 61619521.

It can be written as a sum of positive squares in only one way, i.e., 12278016 + 313600 = 3504^2 + 560^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12591613) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11785 + ... + 12808.

Almost surely, 2^12591616 is an apocalyptic number.

12591616 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

12591616 is a deficient number, since it is larger than the sum of its proper divisors (12568046).

12591616 is an frugal number, since it uses more digits than its factorization.

12591616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24611 (or 24595 counting only the distinct ones).

The product of its digits is 3240, while the sum is 31.

The square root of 12591616 is about 3548.4667111303. The cubic root of 12591616 is about 232.6450538166.

The spelling of 12591616 in words is "twelve million, five hundred ninety-one thousand, six hundred sixteen".