805439513 has 2 divisors, whose sum is σ = 805439514. Its totient is φ = 805439512.

The previous prime is 805439473. The next prime is 805439519. The reversal of 805439513 is 315934508.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 587965504 + 217474009 = 24248^2 + 14747^2 .

It is a cyclic number.

It is not a de Polignac number, because 805439513 - 2¹² = 805435417 is a prime.

It is not a weakly prime, because it can be changed into another prime (805439519) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 402719756 + 402719757.

It is an arithmetic number, because the mean of its divisors is an integer number (402719757).

Almost surely, 2^805439513 is an apocalyptic number.

It is an amenable number.

805439513 is a deficient number, since it is larger than the sum of its proper divisors (1).

805439513 is an equidigital number, since it uses as much as digits as its factorization.

805439513 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 64800, while the sum is 38.

The square root of 805439513 is about 28380.2662602027. The cubic root of 805439513 is about 930.4170145848.

The spelling of 805439513 in words is "eight hundred five million, four hundred thirty-nine thousand, five hundred thirteen".