213313031 has 2 divisors, whose sum is σ = 213313032. Its totient is φ = 213313030.

The previous prime is 213313027. The next prime is 213313049. The reversal of 213313031 is 130313312.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 213313031 - 2² = 213313027 is a prime.

It is a super-2 number, since 2×213313031² = 91004898388813922, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (213313021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106656515 + 106656516.

It is an arithmetic number, because the mean of its divisors is an integer number (106656516).

Almost surely, 2^213313031 is an apocalyptic number.

213313031 is a deficient number, since it is larger than the sum of its proper divisors (1).

213313031 is an equidigital number, since it uses as much as digits as its factorization.

213313031 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 162, while the sum is 17.

The square root of 213313031 is about 14605.2398473972. The cubic root of 213313031 is about 597.5016774869.

Adding to 213313031 its reverse (130313312), we get a palindrome (343626343).

The spelling of 213313031 in words is "two hundred thirteen million, three hundred thirteen thousand, thirty-one".