31031423 has 4 divisors (see below), whose sum is σ = 31753128. Its totient is φ = 30309720.

The previous prime is 31031369. The next prime is 31031431. The reversal of 31031423 is 32413013.

It is a happy number.

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 31031423 - 2⁶ = 31031359 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31031453) 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, 360788 + ... + 360873.

It is an arithmetic number, because the mean of its divisors is an integer number (7938282).

Almost surely, 2^31031423 is an apocalyptic number.

31031423 is a deficient number, since it is larger than the sum of its proper divisors (721705).

31031423 is an equidigital number, since it uses as much as digits as its factorization.

31031423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 721704.

The product of its (nonzero) digits is 216, while the sum is 17.

The square root of 31031423 is about 5570.5855168016. The cubic root of 31031423 is about 314.2441709060.

Adding to 31031423 its reverse (32413013), we get a palindrome (63444436).

The spelling of 31031423 in words is "thirty-one million, thirty-one thousand, four hundred twenty-three".