31130222 has 8 divisors (see below), whose sum is σ = 46783272. Its totient is φ = 15535800.

The previous prime is 31130221. The next prime is 31130233. The reversal of 31130222 is 22203113.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 31130197 and 31130206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31130221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13304 + ... + 15467.

It is an arithmetic number, because the mean of its divisors is an integer number (5847909).

Almost surely, 2^31130222 is an apocalyptic number.

31130222 is a deficient number, since it is larger than the sum of its proper divisors (15653050).

31130222 is a wasteful number, since it uses less digits than its factorization.

31130222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29314.

The product of its (nonzero) digits is 72, while the sum is 14.

The square root of 31130222 is about 5579.4463883077. The cubic root of 31130222 is about 314.5773183574.

Adding to 31130222 its reverse (22203113), we get a palindrome (53333335).

The spelling of 31130222 in words is "thirty-one million, one hundred thirty thousand, two hundred twenty-two".