12515430431 has 4 divisors (see below), whose sum is σ = 14303349072. Its totient is φ = 10727511792.

The previous prime is 12515430407. The next prime is 12515430437. The reversal of 12515430431 is 13403451521.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13403451521 = 80111 ⋅167311.

It is a cyclic number.

It is not a de Polignac number, because 12515430431 - 2³⁰ = 11441688607 is a prime.

It is a super-2 number, since 2×12515430431² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12515430394 and 12515430403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12515430437) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 893959310 + ... + 893959323.

It is an arithmetic number, because the mean of its divisors is an integer number (3575837268).

Almost surely, 2^12515430431 is an apocalyptic number.

12515430431 is a deficient number, since it is larger than the sum of its proper divisors (1787918641).

12515430431 is an equidigital number, since it uses as much as digits as its factorization.

12515430431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1787918640.

The product of its (nonzero) digits is 7200, while the sum is 29.

Adding to 12515430431 its reverse (13403451521), we get a palindrome (25918881952).

The spelling of 12515430431 in words is "twelve billion, five hundred fifteen million, four hundred thirty thousand, four hundred thirty-one".