87609617 has 2 divisors, whose sum is σ = 87609618. Its totient is φ = 87609616.

The previous prime is 87609593. The next prime is 87609629. The reversal of 87609617 is 71690678.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 82609921 + 4999696 = 9089^2 + 2236^2 .

It is a cyclic number.

It is not a de Polignac number, because 87609617 - 2¹² = 87605521 is a prime.

It is not a weakly prime, because it can be changed into another prime (87609647) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43804808 + 43804809.

It is an arithmetic number, because the mean of its divisors is an integer number (43804809).

Almost surely, 2^87609617 is an apocalyptic number.

It is an amenable number.

87609617 is a deficient number, since it is larger than the sum of its proper divisors (1).

87609617 is an equidigital number, since it uses as much as digits as its factorization.

87609617 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 127008, while the sum is 44.

The square root of 87609617 is about 9360.0009081196. Note that the first 3 decimals coincide. The cubic root of 87609617 is about 444.1373127905.

The spelling of 87609617 in words is "eighty-seven million, six hundred nine thousand, six hundred seventeen".