31034221 has 2 divisors, whose sum is σ = 31034222. Its totient is φ = 31034220.

The previous prime is 31034219. The next prime is 31034233. The reversal of 31034221 is 12243013.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 22705225 + 8328996 = 4765^2 + 2886^2 .

It is a cyclic number.

It is not a de Polignac number, because 31034221 - 2¹ = 31034219 is a prime.

Together with 31034219, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 31034195 and 31034204.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31034251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15517110 + 15517111.

It is an arithmetic number, because the mean of its divisors is an integer number (15517111).

Almost surely, 2^31034221 is an apocalyptic number.

It is an amenable number.

31034221 is a deficient number, since it is larger than the sum of its proper divisors (1).

31034221 is an equidigital number, since it uses as much as digits as its factorization.

31034221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 31034221 is about 5570.8366517068. The cubic root of 31034221 is about 314.2536154054.

Adding to 31034221 its reverse (12243013), we get a palindrome (43277234).

The spelling of 31034221 in words is "thirty-one million, thirty-four thousand, two hundred twenty-one".