87611917 has 2 divisors, whose sum is σ = 87611918. Its totient is φ = 87611916.

The previous prime is 87611857. The next prime is 87611933. The reversal of 87611917 is 71911678.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 62821476 + 24790441 = 7926^2 + 4979^2 .

It is a cyclic number.

It is not a de Polignac number, because 87611917 - 2¹¹ = 87609869 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 87611917.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (87611617) 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, 43805958 + 43805959.

It is an arithmetic number, because the mean of its divisors is an integer number (43805959).

Almost surely, 2^87611917 is an apocalyptic number.

It is an amenable number.

87611917 is a deficient number, since it is larger than the sum of its proper divisors (1).

87611917 is an equidigital number, since it uses as much as digits as its factorization.

87611917 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 21168, while the sum is 40.

The square root of 87611917 is about 9360.1237705492. The cubic root of 87611917 is about 444.1411993763.

The spelling of 87611917 in words is "eighty-seven million, six hundred eleven thousand, nine hundred seventeen".