12513891 has 16 divisors (see below), whose sum is σ = 18353664. Its totient is φ = 7535904.

The previous prime is 12513889. The next prime is 12513901. The reversal of 12513891 is 19831521.

It is not a de Polignac number, because 12513891 - 2¹ = 12513889 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12514891) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1581 + ... + 5246.

It is an arithmetic number, because the mean of its divisors is an integer number (1147104).

Almost surely, 2^12513891 is an apocalyptic number.

12513891 is a deficient number, since it is larger than the sum of its proper divisors (5839773).

12513891 is a wasteful number, since it uses less digits than its factorization.

12513891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6890.

The product of its digits is 2160, while the sum is 30.

The square root of 12513891 is about 3537.4978445223. The cubic root of 12513891 is about 232.1653782693.

The spelling of 12513891 in words is "twelve million, five hundred thirteen thousand, eight hundred ninety-one".