213040031 has 2 divisors, whose sum is σ = 213040032. Its totient is φ = 213040030.

The previous prime is 213040021. The next prime is 213040057. The reversal of 213040031 is 130040312.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-213040031 is a prime.

It is a super-2 number, since 2×213040031² = 90772109616961922, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 213039988 and 213040015.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (213040021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106520015 + 106520016.

It is an arithmetic number, because the mean of its divisors is an integer number (106520016).

Almost surely, 2^213040031 is an apocalyptic number.

213040031 is a deficient number, since it is larger than the sum of its proper divisors (1).

213040031 is an equidigital number, since it uses as much as digits as its factorization.

213040031 is an evil number, because the sum of its binary digits is even.

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

The square root of 213040031 is about 14595.8908943579. The cubic root of 213040031 is about 597.2466726031.

Adding to 213040031 its reverse (130040312), we get a palindrome (343080343).

The spelling of 213040031 in words is "two hundred thirteen million, forty thousand, thirty-one".