12923687431 has 4 divisors (see below), whose sum is σ = 13198659552. Its totient is φ = 12648715312.

The previous prime is 12923687407. The next prime is 12923687443. The reversal of 12923687431 is 13478632921.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13478632921 = 13 ⋅1036817917.

It is a cyclic number.

It is not a de Polignac number, because 12923687431 - 2⁷ = 12923687303 is a prime.

It is a super-2 number, since 2×12923687431² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12923687461) 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, 137485990 + ... + 137486083.

It is an arithmetic number, because the mean of its divisors is an integer number (3299664888).

Almost surely, 2^12923687431 is an apocalyptic number.

12923687431 is a deficient number, since it is larger than the sum of its proper divisors (274972121).

12923687431 is an equidigital number, since it uses as much as digits as its factorization.

12923687431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 274972120.

The product of its digits is 435456, while the sum is 46.

The spelling of 12923687431 in words is "twelve billion, nine hundred twenty-three million, six hundred eighty-seven thousand, four hundred thirty-one".