31230213 has 16 divisors (see below), whose sum is σ = 47836800. Its totient is φ = 17752896.

The previous prime is 31230211. The next prime is 31230223. The reversal of 31230213 is 31203213.

It is not a de Polignac number, because 31230213 - 2¹ = 31230211 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 31230192 and 31230201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31230211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 363 + ... + 7911.

It is an arithmetic number, because the mean of its divisors is an integer number (2989800).

Almost surely, 2^31230213 is an apocalyptic number.

It is an amenable number.

31230213 is a deficient number, since it is larger than the sum of its proper divisors (16606587).

31230213 is a wasteful number, since it uses less digits than its factorization.

31230213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7756.

The product of its (nonzero) digits is 108, while the sum is 15.

The square root of 31230213 is about 5588.3998604252. The cubic root of 31230213 is about 314.9137682832.

Adding to 31230213 its reverse (31203213), we get a palindrome (62433426).

Subtracting from 31230213 its reverse (31203213), we obtain a cube (27000 = 30³).

The spelling of 31230213 in words is "thirty-one million, two hundred thirty thousand, two hundred thirteen".