31504013423 has 4 divisors (see below), whose sum is σ = 31538596128. Its totient is φ = 31469430720.

The previous prime is 31504013383. The next prime is 31504013447. The reversal of 31504013423 is 32431040513.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 32431040513 = 103 ⋅314864471.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31504013423 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31504013392 and 31504013401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31504013623) 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, 17289986 + ... + 17291807.

It is an arithmetic number, because the mean of its divisors is an integer number (7884649032).

Almost surely, 2^31504013423 is an apocalyptic number.

31504013423 is a deficient number, since it is larger than the sum of its proper divisors (34582705).

31504013423 is an equidigital number, since it uses as much as digits as its factorization.

31504013423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34582704.

The product of its (nonzero) digits is 4320, while the sum is 26.

Adding to 31504013423 its reverse (32431040513), we get a palindrome (63935053936).

The spelling of 31504013423 in words is "thirty-one billion, five hundred four million, thirteen thousand, four hundred twenty-three".