818491441 has 2 divisors, whose sum is σ = 818491442. Its totient is φ = 818491440.

The previous prime is 818491433. The next prime is 818491493. The reversal of 818491441 is 144194818.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 817960000 + 531441 = 28600^2 + 729^2 .

It is a cyclic number.

It is not a de Polignac number, because 818491441 - 2³ = 818491433 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 818491394 and 818491403.

It is not a weakly prime, because it can be changed into another prime (818494441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 409245720 + 409245721.

It is an arithmetic number, because the mean of its divisors is an integer number (409245721).

Almost surely, 2^818491441 is an apocalyptic number.

It is an amenable number.

818491441 is a deficient number, since it is larger than the sum of its proper divisors (1).

818491441 is an equidigital number, since it uses as much as digits as its factorization.

818491441 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 36864, while the sum is 40.

The square root of 818491441 is about 28609.2894179495. The cubic root of 818491441 is about 935.4158276981.

The spelling of 818491441 in words is "eight hundred eighteen million, four hundred ninety-one thousand, four hundred forty-one".