31311423 has 24 divisors (see below), whose sum is σ = 53136720. Its totient is φ = 17516160.

The previous prime is 31311421. The next prime is 31311431. The reversal of 31311423 is 32411313.

It is not a de Polignac number, because 31311423 - 2¹ = 31311421 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 31311396 and 31311405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31311421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10878 + ... + 13451.

It is an arithmetic number, because the mean of its divisors is an integer number (2214030).

Almost surely, 2^31311423 is an apocalyptic number.

31311423 is a gapful number since it is divisible by the number (33) formed by its first and last digit.

31311423 is a deficient number, since it is larger than the sum of its proper divisors (21825297).

31311423 is a wasteful number, since it uses less digits than its factorization.

31311423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24359 (or 24356 counting only the distinct ones).

The product of its digits is 216, while the sum is 18.

The square root of 31311423 is about 5595.6610869494. The cubic root of 31311423 is about 315.1864957614.

Adding to 31311423 its reverse (32411313), we get a palindrome (63722736).

It can be divided in two parts, 3131 and 1423, that added together give a palindrome (4554).

The spelling of 31311423 in words is "thirty-one million, three hundred eleven thousand, four hundred twenty-three".