31423312 has 20 divisors (see below), whose sum is σ = 61151220. Its totient is φ = 15642368.

The previous prime is 31423297. The next prime is 31423331. The reversal of 31423312 is 21332413.

It can be written as a sum of positive squares in 2 ways, for example, as 5779216 + 25644096 = 2404^2 + 5064^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 31423312.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 487 + ... + 7942.

It is an arithmetic number, because the mean of its divisors is an integer number (3057561).

Almost surely, 2^31423312 is an apocalyptic number.

It is an amenable number.

31423312 is a deficient number, since it is larger than the sum of its proper divisors (29727908).

31423312 is a wasteful number, since it uses less digits than its factorization.

31423312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8670 (or 8664 counting only the distinct ones).

The product of its digits is 432, while the sum is 19.

The square root of 31423312 is about 5605.6500069127. The cubic root of 31423312 is about 315.5614811498.

Adding to 31423312 its reverse (21332413), we get a palindrome (52755725).

The spelling of 31423312 in words is "thirty-one million, four hundred twenty-three thousand, three hundred twelve".