12545431 has 4 divisors (see below), whose sum is σ = 12560832. Its totient is φ = 12530032.

The previous prime is 12545417. The next prime is 12545447. The reversal of 12545431 is 13454521.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13454521 = 29 ⋅463949.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12545431 is a prime.

It is a super-2 number, since 2×12545431² = 314775677951522, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12545396 and 12545405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12545411) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6406 + ... + 8131.

It is an arithmetic number, because the mean of its divisors is an integer number (3140208).

Almost surely, 2^12545431 is an apocalyptic number.

12545431 is a deficient number, since it is larger than the sum of its proper divisors (15401).

12545431 is an equidigital number, since it uses as much as digits as its factorization.

12545431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15400.

The product of its digits is 2400, while the sum is 25.

The square root of 12545431 is about 3541.9529923476. The cubic root of 12545431 is about 232.3602644364.

Adding to 12545431 its reverse (13454521), we get a palindrome (25999952).

The spelling of 12545431 in words is "twelve million, five hundred forty-five thousand, four hundred thirty-one".