805121533 has 2 divisors, whose sum is σ = 805121534. Its totient is φ = 805121532.

The previous prime is 805121477. The next prime is 805121567. The reversal of 805121533 is 335121508.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 794506969 + 10614564 = 28187^2 + 3258^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-805121533 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (805121593) 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, 402560766 + 402560767.

It is an arithmetic number, because the mean of its divisors is an integer number (402560767).

Almost surely, 2^805121533 is an apocalyptic number.

It is an amenable number.

805121533 is a deficient number, since it is larger than the sum of its proper divisors (1).

805121533 is an equidigital number, since it uses as much as digits as its factorization.

805121533 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3600, while the sum is 28.

The square root of 805121533 is about 28374.6635750981. The cubic root of 805121533 is about 930.2945584850.

It can be divided in two parts, 8051 and 21533, that added together give a square (29584 = 172²).

The spelling of 805121533 in words is "eight hundred five million, one hundred twenty-one thousand, five hundred thirty-three".