12531403 has 4 divisors (see below), whose sum is σ = 12646480. Its totient is φ = 12416328.

The previous prime is 12531391. The next prime is 12531437. The reversal of 12531403 is 30413521.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 30413521 = 23 ⋅1322327.

It is a cyclic number.

It is not a de Polignac number, because 12531403 - 2⁹ = 12530891 is a prime.

It is a super-2 number, since 2×12531403² = 314072122296818, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12531443) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 57375 + ... + 57592.

It is an arithmetic number, because the mean of its divisors is an integer number (3161620).

Almost surely, 2^12531403 is an apocalyptic number.

12531403 is a deficient number, since it is larger than the sum of its proper divisors (115077).

12531403 is a wasteful number, since it uses less digits than its factorization.

12531403 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115076.

The product of its (nonzero) digits is 360, while the sum is 19.

The square root of 12531403 is about 3539.9721750319. The cubic root of 12531403 is about 232.2736255780.

Adding to 12531403 its reverse (30413521), we get a palindrome (42944924).

The spelling of 12531403 in words is "twelve million, five hundred thirty-one thousand, four hundred three".