31331423 has 4 divisors (see below), whose sum is σ = 31344768. Its totient is φ = 31318080.

The previous prime is 31331407. The next prime is 31331429. The reversal of 31331423 is 32413313.

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

It is a cyclic number.

It is not a de Polignac number, because 31331423 - 2⁴ = 31331407 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31331395 and 31331404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31331429) 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, 2111 + ... + 8192.

It is an arithmetic number, because the mean of its divisors is an integer number (7836192).

Almost surely, 2^31331423 is an apocalyptic number.

31331423 is a deficient number, since it is larger than the sum of its proper divisors (13345).

31331423 is a wasteful number, since it uses less digits than its factorization.

31331423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13344.

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

The square root of 31331423 is about 5597.4479006061. The cubic root of 31331423 is about 315.2535893610.

Adding to 31331423 its reverse (32413313), we get a palindrome (63744736).

The spelling of 31331423 in words is "thirty-one million, three hundred thirty-one thousand, four hundred twenty-three".