12503987731 has 4 divisors (see below), whose sum is σ = 12505306464. Its totient is φ = 12502669000.

The previous prime is 12503987729. The next prime is 12503987753. The reversal of 12503987731 is 13778930521.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13778930521 = 20029 ⋅687949.

It is a cyclic number.

It is not a de Polignac number, because 12503987731 - 2¹ = 12503987729 is a prime.

It is a super-2 number, since 2×12503987731² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12503987231) 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, 645040 + ... + 664141.

It is an arithmetic number, because the mean of its divisors is an integer number (3126326616).

Almost surely, 2^12503987731 is an apocalyptic number.

12503987731 is a deficient number, since it is larger than the sum of its proper divisors (1318733).

12503987731 is an equidigital number, since it uses as much as digits as its factorization.

12503987731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1318732.

The product of its (nonzero) digits is 317520, while the sum is 46.

The spelling of 12503987731 in words is "twelve billion, five hundred three million, nine hundred eighty-seven thousand, seven hundred thirty-one".