85809001 has 2 divisors, whose sum is σ = 85809002. Its totient is φ = 85809000.

The previous prime is 85808963. The next prime is 85809041. The reversal of 85809001 is 10090858.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 72675625 + 13133376 = 8525^2 + 3624^2 .

It is a cyclic number.

It is not a de Polignac number, because 85809001 - 2⁷ = 85808873 is a prime.

It is not a weakly prime, because it can be changed into another prime (85809041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42904500 + 42904501.

It is an arithmetic number, because the mean of its divisors is an integer number (42904501).

Almost surely, 2^85809001 is an apocalyptic number.

It is an amenable number.

85809001 is a deficient number, since it is larger than the sum of its proper divisors (1).

85809001 is an equidigital number, since it uses as much as digits as its factorization.

85809001 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2880, while the sum is 31.

The square root of 85809001 is about 9263.3147954714. The cubic root of 85809001 is about 441.0734825096.

Adding to 85809001 its reverse (10090858), we get a palindrome (95899859).

The spelling of 85809001 in words is "eighty-five million, eight hundred nine thousand, one".