811713501601 has 2 divisors, whose sum is σ = 811713501602. Its totient is φ = 811713501600.

The previous prime is 811713501479. The next prime is 811713501607. The reversal of 811713501601 is 106105317118.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 761526749025 + 50186752576 = 872655^2 + 224024^2 .

It is a cyclic number.

It is not a de Polignac number, because 811713501601 - 2⁹ = 811713501089 is a prime.

It is not a weakly prime, because it can be changed into another prime (811713501607) 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, 405856750800 + 405856750801.

It is an arithmetic number, because the mean of its divisors is an integer number (405856750801).

Almost surely, 2^811713501601 is an apocalyptic number.

It is an amenable number.

811713501601 is a deficient number, since it is larger than the sum of its proper divisors (1).

811713501601 is an equidigital number, since it uses as much as digits as its factorization.

811713501601 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5040, while the sum is 34.

Adding to 811713501601 its reverse (106105317118), we get a palindrome (917818818719).

The spelling of 811713501601 in words is "eight hundred eleven billion, seven hundred thirteen million, five hundred one thousand, six hundred one".