817250761 has 2 divisors, whose sum is σ = 817250762. Its totient is φ = 817250760.

The previous prime is 817250747. The next prime is 817250779. The reversal of 817250761 is 167052718.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 668532736 + 148718025 = 25856^2 + 12195^2 .

It is a cyclic number.

It is not a de Polignac number, because 817250761 - 2²⁹ = 280379849 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 817250761.

It is not a weakly prime, because it can be changed into another prime (817254761) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 408625380 + 408625381.

It is an arithmetic number, because the mean of its divisors is an integer number (408625381).

Almost surely, 2^817250761 is an apocalyptic number.

It is an amenable number.

817250761 is a deficient number, since it is larger than the sum of its proper divisors (1).

817250761 is an equidigital number, since it uses as much as digits as its factorization.

817250761 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 23520, while the sum is 37.

The square root of 817250761 is about 28587.5980278162. The cubic root of 817250761 is about 934.9429501828.

The spelling of 817250761 in words is "eight hundred seventeen million, two hundred fifty thousand, seven hundred sixty-one".