31421223 has 16 divisors (see below), whose sum is σ = 47142400. Its totient is φ = 20680920.

The previous prime is 31421213. The next prime is 31421233. The reversal of 31421223 is 32212413.

It is an interprime number because it is at equal distance from previous prime (31421213) and next prime (31421233).

It is a de Polignac number, because none of the positive numbers 2^k-31421223 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31421196 and 31421205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31421213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5233 + ... + 9498.

It is an arithmetic number, because the mean of its divisors is an integer number (2946400).

Almost surely, 2^31421223 is an apocalyptic number.

31421223 is a deficient number, since it is larger than the sum of its proper divisors (15721177).

31421223 is a wasteful number, since it uses less digits than its factorization.

31421223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14819 (or 14813 counting only the distinct ones).

The product of its digits is 288, while the sum is 18.

The square root of 31421223 is about 5605.4636739524. The cubic root of 31421223 is about 315.5544882253.

Adding to 31421223 its reverse (32212413), we get a palindrome (63633636).

The spelling of 31421223 in words is "thirty-one million, four hundred twenty-one thousand, two hundred twenty-three".