87554809 has 2 divisors, whose sum is σ = 87554810. Its totient is φ = 87554808.

The previous prime is 87554801. The next prime is 87554821. The reversal of 87554809 is 90845578.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 69889600 + 17665209 = 8360^2 + 4203^2 .

It is a cyclic number.

It is not a de Polignac number, because 87554809 - 2³ = 87554801 is a prime.

It is not a weakly prime, because it can be changed into another prime (87554801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43777404 + 43777405.

It is an arithmetic number, because the mean of its divisors is an integer number (43777405).

Almost surely, 2^87554809 is an apocalyptic number.

It is an amenable number.

87554809 is a deficient number, since it is larger than the sum of its proper divisors (1).

87554809 is an equidigital number, since it uses as much as digits as its factorization.

87554809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 403200, while the sum is 46.

The square root of 87554809 is about 9357.0726725830. The cubic root of 87554809 is about 444.0446770101.

The spelling of 87554809 in words is "eighty-seven million, five hundred fifty-four thousand, eight hundred nine".