12315451 has 4 divisors (see below), whose sum is σ = 12547872. Its totient is φ = 12083032.

The previous prime is 12315449. The next prime is 12315461. The reversal of 12315451 is 15451321.

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: 15451321 = 3041 ⋅5081.

It is a cyclic number.

It is not a de Polignac number, because 12315451 - 2¹ = 12315449 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12315461) 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, 116131 + ... + 116236.

It is an arithmetic number, because the mean of its divisors is an integer number (3136968).

Almost surely, 2^12315451 is an apocalyptic number.

12315451 is the 2220-th centered pentagonal number.

12315451 is a deficient number, since it is larger than the sum of its proper divisors (232421).

12315451 is an equidigital number, since it uses as much as digits as its factorization.

12315451 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 232420.

The product of its digits is 600, while the sum is 22.

The square root of 12315451 is about 3509.3376868007. The cubic root of 12315451 is about 230.9316402234.

Adding to 12315451 its reverse (15451321), we get a palindrome (27766772).

The spelling of 12315451 in words is "twelve million, three hundred fifteen thousand, four hundred fifty-one".