31503423 has 12 divisors (see below), whose sum is σ = 48862680. Its totient is φ = 18001872.

The previous prime is 31503379. The next prime is 31503443. The reversal of 31503423 is 32430513.

It is not a de Polignac number, because 31503423 - 2⁸ = 31503167 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a self number, because there is not a number n which added to its sum of digits gives 31503423.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31503443) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 107008 + ... + 107301.

It is an arithmetic number, because the mean of its divisors is an integer number (4071890).

Almost surely, 2^31503423 is an apocalyptic number.

31503423 is a deficient number, since it is larger than the sum of its proper divisors (17359257).

31503423 is a wasteful number, since it uses less digits than its factorization.

31503423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 214326 (or 214319 counting only the distinct ones).

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

The square root of 31503423 is about 5612.7910169540. The cubic root of 31503423 is about 315.8294190975.

Adding to 31503423 its reverse (32430513), we get a palindrome (63933936).

The spelling of 31503423 in words is "thirty-one million, five hundred three thousand, four hundred twenty-three".