31313423 has 4 divisors (see below), whose sum is σ = 31742448. Its totient is φ = 30884400.

The previous prime is 31313389. The next prime is 31313453. The reversal of 31313423 is 32431313.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31313423 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31313395 and 31313404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31313453) 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, 214403 + ... + 214548.

It is an arithmetic number, because the mean of its divisors is an integer number (7935612).

Almost surely, 2^31313423 is an apocalyptic number.

31313423 is a deficient number, since it is larger than the sum of its proper divisors (429025).

31313423 is an equidigital number, since it uses as much as digits as its factorization.

31313423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 429024.

The product of its digits is 648, while the sum is 20.

The square root of 31313423 is about 5595.8397939898. The cubic root of 31313423 is about 315.1932064068.

Adding to 31313423 its reverse (32431313), we get a palindrome (63744736).

The spelling of 31313423 in words is "thirty-one million, three hundred thirteen thousand, four hundred twenty-three".