87005909 has 2 divisors, whose sum is σ = 87005910. Its totient is φ = 87005908.

The previous prime is 87005879. The next prime is 87005929. The reversal of 87005909 is 90950078.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 79834225 + 7171684 = 8935^2 + 2678^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-87005909 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (87005929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43502954 + 43502955.

It is an arithmetic number, because the mean of its divisors is an integer number (43502955).

Almost surely, 2^87005909 is an apocalyptic number.

It is an amenable number.

87005909 is a deficient number, since it is larger than the sum of its proper divisors (1).

87005909 is an equidigital number, since it uses as much as digits as its factorization.

87005909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 22680, while the sum is 38.

The square root of 87005909 is about 9327.6958033589. The cubic root of 87005909 is about 443.1147937662.

The spelling of 87005909 in words is "eighty-seven million, five thousand, nine hundred nine".