31133423 has 4 divisors (see below), whose sum is σ = 31197840. Its totient is φ = 31069008.

The previous prime is 31133321. The next prime is 31133437. The reversal of 31133423 is 32433113.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 32433113 = 89 ⋅364417.

It is a cyclic number.

It is not a de Polignac number, because 31133423 - 2²² = 26939119 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31133395 and 31133404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31133483) 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 3 ways as a sum of consecutive naturals, for example, 31478 + ... + 32451.

It is an arithmetic number, because the mean of its divisors is an integer number (7799460).

Almost surely, 2^31133423 is an apocalyptic number.

31133423 is a deficient number, since it is larger than the sum of its proper divisors (64417).

31133423 is an equidigital number, since it uses as much as digits as its factorization.

31133423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64416.

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

The square root of 31133423 is about 5579.7332373510. The cubic root of 31133423 is about 314.5881002431.

Adding to 31133423 its reverse (32433113), we get a palindrome (63566536).

The spelling of 31133423 in words is "thirty-one million, one hundred thirty-three thousand, four hundred twenty-three".