811605001 has 2 divisors, whose sum is σ = 811605002. Its totient is φ = 811605000.

The previous prime is 811604987. The next prime is 811605013. The reversal of 811605001 is 100506118.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 686702025 + 124902976 = 26205^2 + 11176^2 .

It is a cyclic number.

It is not a de Polignac number, because 811605001 - 2¹³ = 811596809 is a prime.

It is not a weakly prime, because it can be changed into another prime (811600001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 405802500 + 405802501.

It is an arithmetic number, because the mean of its divisors is an integer number (405802501).

Almost surely, 2^811605001 is an apocalyptic number.

It is an amenable number.

811605001 is a deficient number, since it is larger than the sum of its proper divisors (1).

811605001 is an equidigital number, since it uses as much as digits as its factorization.

811605001 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 240, while the sum is 22.

The square root of 811605001 is about 28488.6819807446. The cubic root of 811605001 is about 932.7850383222.

The spelling of 811605001 in words is "eight hundred eleven million, six hundred five thousand, one".