12599991 has 6 divisors (see below), whose sum is σ = 18200000. Its totient is φ = 8399988.

The previous prime is 12599987. The next prime is 12600001. The reversal of 12599991 is 19999521.

12599991 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 12599991 - 2² = 12599987 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 (12599911) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 699991 + ... + 700008.

Almost surely, 2^12599991 is an apocalyptic number.

12599991 is a deficient number, since it is larger than the sum of its proper divisors (5600009).

12599991 is a wasteful number, since it uses less digits than its factorization.

12599991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1400005 (or 1400002 counting only the distinct ones).

The product of its digits is 65610, while the sum is 45.

The square root of 12599991 is about 3549.6466021282. The cubic root of 12599991 is about 232.6966217411.

The spelling of 12599991 in words is "twelve million, five hundred ninety-nine thousand, nine hundred ninety-one".