87917717 has 2 divisors, whose sum is σ = 87917718. Its totient is φ = 87917716.

The previous prime is 87917701. The next prime is 87917723. The reversal of 87917717 is 71771978.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 80442961 + 7474756 = 8969^2 + 2734^2 .

It is a cyclic number.

It is not a de Polignac number, because 87917717 - 2⁴ = 87917701 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (87917737) 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, 43958858 + 43958859.

It is an arithmetic number, because the mean of its divisors is an integer number (43958859).

Almost surely, 2^87917717 is an apocalyptic number.

It is an amenable number.

87917717 is a deficient number, since it is larger than the sum of its proper divisors (1).

87917717 is an equidigital number, since it uses as much as digits as its factorization.

87917717 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 172872, while the sum is 47.

The square root of 87917717 is about 9376.4447953369. Note that the first 3 decimals coincide. The cubic root of 87917717 is about 444.6573417357.

The spelling of 87917717 in words is "eighty-seven million, nine hundred seventeen thousand, seven hundred seventeen".