87963209 has 2 divisors, whose sum is σ = 87963210. Its totient is φ = 87963208.

The previous prime is 87963191. The next prime is 87963263. The reversal of 87963209 is 90236978.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 87235600 + 727609 = 9340^2 + 853^2 .

It is a cyclic number.

It is not a de Polignac number, because 87963209 - 2¹⁶ = 87897673 is a prime.

It is a super-2 number, since 2×87963209² = 15475052275155362, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 87963209.

It is not a weakly prime, because it can be changed into another prime (87963299) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43981604 + 43981605.

It is an arithmetic number, because the mean of its divisors is an integer number (43981605).

Almost surely, 2^87963209 is an apocalyptic number.

It is an amenable number.

87963209 is a deficient number, since it is larger than the sum of its proper divisors (1).

87963209 is an equidigital number, since it uses as much as digits as its factorization.

87963209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 163296, while the sum is 44.

The square root of 87963209 is about 9378.8703477551. The cubic root of 87963209 is about 444.7340227677.

The spelling of 87963209 in words is "eighty-seven million, nine hundred sixty-three thousand, two hundred nine".