817635061 has 2 divisors, whose sum is σ = 817635062. Its totient is φ = 817635060.

The previous prime is 817635047. The next prime is 817635089. The reversal of 817635061 is 160536718.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 817616836 + 18225 = 28594^2 + 135^2 .

It is a cyclic number.

It is not a de Polignac number, because 817635061 - 2⁵ = 817635029 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 817635061.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (817635001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 408817530 + 408817531.

It is an arithmetic number, because the mean of its divisors is an integer number (408817531).

Almost surely, 2^817635061 is an apocalyptic number.

It is an amenable number.

817635061 is a deficient number, since it is larger than the sum of its proper divisors (1).

817635061 is an equidigital number, since it uses as much as digits as its factorization.

817635061 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 30240, while the sum is 37.

The square root of 817635061 is about 28594.3186839624. The cubic root of 817635061 is about 935.0894748847.

The spelling of 817635061 in words is "eight hundred seventeen million, six hundred thirty-five thousand, sixty-one".