213031031 has 2 divisors, whose sum is σ = 213031032. Its totient is φ = 213031030.

The previous prime is 213031019. The next prime is 213031043. The reversal of 213031031 is 130130312.

It is a balanced prime because it is at equal distance from previous prime (213031019) and next prime (213031043).

It is a cyclic number.

It is not a de Polignac number, because 213031031 - 2⁶ = 213030967 is a prime.

It is a super-2 number, since 2×213031031² = 90764440337845922, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 213030997 and 213031015.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (213031001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106515515 + 106515516.

It is an arithmetic number, because the mean of its divisors is an integer number (106515516).

Almost surely, 2^213031031 is an apocalyptic number.

213031031 is a deficient number, since it is larger than the sum of its proper divisors (1).

213031031 is an equidigital number, since it uses as much as digits as its factorization.

213031031 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 54, while the sum is 14.

The square root of 213031031 is about 14595.5825851523. The cubic root of 213031031 is about 597.2382621403.

Adding to 213031031 its reverse (130130312), we get a palindrome (343161343).

The spelling of 213031031 in words is "two hundred thirteen million, thirty-one thousand, thirty-one".