231840634213 has 2 divisors, whose sum is σ = 231840634214. Its totient is φ = 231840634212.

The previous prime is 231840634169. The next prime is 231840634243. The reversal of 231840634213 is 312436048132.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 225266992129 + 6573642084 = 474623^2 + 81078^2 .

It is a cyclic number.

It is not a de Polignac number, because 231840634213 - 2²¹ = 231838537061 is a prime.

It is a super-2 number, since 2×231840634213² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (231840634243) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115920317106 + 115920317107.

It is an arithmetic number, because the mean of its divisors is an integer number (115920317107).

Almost surely, 2^231840634213 is an apocalyptic number.

It is an amenable number.

231840634213 is a deficient number, since it is larger than the sum of its proper divisors (1).

231840634213 is an equidigital number, since it uses as much as digits as its factorization.

231840634213 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 82944, while the sum is 37.

The spelling of 231840634213 in words is "two hundred thirty-one billion, eight hundred forty million, six hundred thirty-four thousand, two hundred thirteen".