12531418 has 4 divisors (see below), whose sum is σ = 18797130. Its totient is φ = 6265708.

The previous prime is 12531391. The next prime is 12531437. The reversal of 12531418 is 81413521.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 81413521 = 7 ⋅11630503.

It can be written as a sum of positive squares in only one way, i.e., 10936249 + 1595169 = 3307^2 + 1263^2 .

It is a junction number, because it is equal to n+sod(n) for n = 12531392 and 12531401.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3132853 + ... + 3132856.

Almost surely, 2^12531418 is an apocalyptic number.

12531418 is a deficient number, since it is larger than the sum of its proper divisors (6265712).

12531418 is an equidigital number, since it uses as much as digits as its factorization.

12531418 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6265711.

The product of its digits is 960, while the sum is 25.

The square root of 12531418 is about 3539.9742936920. The cubic root of 12531418 is about 232.2737182546.

Adding to 12531418 its reverse (81413521), we get a palindrome (93944939).

The spelling of 12531418 in words is "twelve million, five hundred thirty-one thousand, four hundred eighteen".