12531031 has 4 divisors (see below), whose sum is σ = 12543552. Its totient is φ = 12518512.

The previous prime is 12531019. The next prime is 12531041. The reversal of 12531031 is 13013521.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13013521 = 31 ⋅419791.

It is a cyclic number.

It is not a de Polignac number, because 12531031 - 2¹⁵ = 12498263 is a prime.

It is a super-2 number, since 2×12531031² = 314053475845922, 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 = 12530996 and 12531014.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12531041) 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, 4615 + ... + 6808.

It is an arithmetic number, because the mean of its divisors is an integer number (3135888).

Almost surely, 2^12531031 is an apocalyptic number.

12531031 is a deficient number, since it is larger than the sum of its proper divisors (12521).

12531031 is a wasteful number, since it uses less digits than its factorization.

12531031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12520.

The product of its (nonzero) digits is 90, while the sum is 16.

The square root of 12531031 is about 3539.9196318561. The cubic root of 12531031 is about 232.2713271750.

Adding to 12531031 its reverse (13013521), we get a palindrome (25544552).

The spelling of 12531031 in words is "twelve million, five hundred thirty-one thousand, thirty-one".