12512391 has 16 divisors (see below), whose sum is σ = 18434304. Its totient is φ = 7508864.

The previous prime is 12512389. The next prime is 12512407. The reversal of 12512391 is 19321521.

It is a cyclic number.

It is not a de Polignac number, because 12512391 - 2¹ = 12512389 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12512351) 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, 4161 + ... + 6506.

It is an arithmetic number, because the mean of its divisors is an integer number (1152144).

Almost surely, 2^12512391 is an apocalyptic number.

12512391 is a deficient number, since it is larger than the sum of its proper divisors (5921913).

12512391 is a wasteful number, since it uses less digits than its factorization.

12512391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10710.

The product of its digits is 540, while the sum is 24.

The square root of 12512391 is about 3537.2858239051. The cubic root of 12512391 is about 232.1561015921.

The spelling of 12512391 in words is "twelve million, five hundred twelve thousand, three hundred ninety-one".