31530423 has 4 divisors (see below), whose sum is σ = 42040568. Its totient is φ = 21020280.

The previous prime is 31530419. The next prime is 31530437. The reversal of 31530423 is 32403513.

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

It is not a de Polignac number, because 31530423 - 2² = 31530419 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 31530423.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31530523) 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, 5255068 + ... + 5255073.

It is an arithmetic number, because the mean of its divisors is an integer number (10510142).

Almost surely, 2^31530423 is an apocalyptic number.

31530423 is a deficient number, since it is larger than the sum of its proper divisors (10510145).

31530423 is a wasteful number, since it uses less digits than its factorization.

31530423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10510144.

The product of its (nonzero) digits is 1080, while the sum is 21.

The square root of 31530423 is about 5615.1957223235. The cubic root of 31530423 is about 315.9196205056.

Adding to 31530423 its reverse (32403513), we get a palindrome (63933936).

The spelling of 31530423 in words is "thirty-one million, five hundred thirty thousand, four hundred twenty-three".