811897001 has 2 divisors, whose sum is σ = 811897002. Its totient is φ = 811897000.

The previous prime is 811896979. The next prime is 811897013. The reversal of 811897001 is 100798118.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 462207001 + 349690000 = 21499^2 + 18700^2 .

It is a cyclic number.

It is not a de Polignac number, because 811897001 - 2⁶ = 811896937 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (811897201) 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, 405948500 + 405948501.

It is an arithmetic number, because the mean of its divisors is an integer number (405948501).

Almost surely, 2^811897001 is an apocalyptic number.

It is an amenable number.

811897001 is a deficient number, since it is larger than the sum of its proper divisors (1).

811897001 is an equidigital number, since it uses as much as digits as its factorization.

811897001 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4032, while the sum is 35.

The square root of 811897001 is about 28493.8063620851. The cubic root of 811897001 is about 932.8968909979.

The spelling of 811897001 in words is "eight hundred eleven million, eight hundred ninety-seven thousand, one".