231818641 has 2 divisors, whose sum is σ = 231818642. Its totient is φ = 231818640.

The previous prime is 231818599. The next prime is 231818683. The reversal of 231818641 is 146818132.

It is a balanced prime because it is at equal distance from previous prime (231818599) and next prime (231818683).

It can be written as a sum of positive squares in only one way, i.e., 224550225 + 7268416 = 14985^2 + 2696^2 .

It is a cyclic number.

It is not a de Polignac number, because 231818641 - 2⁷ = 231818513 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 231818597 and 231818606.

It is not a weakly prime, because it can be changed into another prime (231818941) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115909320 + 115909321.

It is an arithmetic number, because the mean of its divisors is an integer number (115909321).

Almost surely, 2^231818641 is an apocalyptic number.

It is an amenable number.

231818641 is a deficient number, since it is larger than the sum of its proper divisors (1).

231818641 is an equidigital number, since it uses as much as digits as its factorization.

231818641 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9216, while the sum is 34.

The square root of 231818641 is about 15225.5916469607. The cubic root of 231818641 is about 614.3032106660.

The spelling of 231818641 in words is "two hundred thirty-one million, eight hundred eighteen thousand, six hundred forty-one".