31117223 has 4 divisors (see below), whose sum is σ = 31241448. Its totient is φ = 30993000.

The previous prime is 31117217. The next prime is 31117253. The reversal of 31117223 is 32271113.

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 31117223 - 2¹⁶ = 31051687 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31117195 and 31117204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31117253) 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 3 ways as a sum of consecutive naturals, for example, 61736 + ... + 62237.

It is an arithmetic number, because the mean of its divisors is an integer number (7810362).

Almost surely, 2^31117223 is an apocalyptic number.

31117223 is a deficient number, since it is larger than the sum of its proper divisors (124225).

31117223 is a wasteful number, since it uses less digits than its factorization.

31117223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 124224.

The product of its digits is 252, while the sum is 20.

The square root of 31117223 is about 5578.2813661557. The cubic root of 31117223 is about 314.5335264021.

Adding to 31117223 its reverse (32271113), we get a palindrome (63388336).

The spelling of 31117223 in words is "thirty-one million, one hundred seventeen thousand, two hundred twenty-three".