811818001 has 2 divisors, whose sum is σ = 811818002. Its totient is φ = 811818000.

The previous prime is 811817989. The next prime is 811818019. The reversal of 811818001 is 100818118.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 722534400 + 89283601 = 26880^2 + 9449^2 .

It is a cyclic number.

It is not a de Polignac number, because 811818001 - 2⁵ = 811817969 is a prime.

It is not a weakly prime, because it can be changed into another prime (811818041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 405909000 + 405909001.

It is an arithmetic number, because the mean of its divisors is an integer number (405909001).

Almost surely, 2^811818001 is an apocalyptic number.

It is an amenable number.

811818001 is a deficient number, since it is larger than the sum of its proper divisors (1).

811818001 is an equidigital number, since it uses as much as digits as its factorization.

811818001 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 512, while the sum is 28.

The square root of 811818001 is about 28492.4200621850. The cubic root of 811818001 is about 932.8666321330.

The spelling of 811818001 in words is "eight hundred eleven million, eight hundred eighteen thousand, one".