87390881609 has 2 divisors, whose sum is σ = 87390881610. Its totient is φ = 87390881608.

The previous prime is 87390881447. The next prime is 87390881629. The reversal of 87390881609 is 90618809378.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 87292475209 + 98406400 = 295453^2 + 9920^2 .

It is a cyclic number.

It is not a de Polignac number, because 87390881609 - 2²⁸ = 87122446153 is a prime.

It is a super-4 number, since 4×87390881609⁴ (a number of 45 digits) contains 4444 as substring.

It is not a weakly prime, because it can be changed into another prime (87390881629) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43695440804 + 43695440805.

It is an arithmetic number, because the mean of its divisors is an integer number (43695440805).

Almost surely, 2^87390881609 is an apocalyptic number.

It is an amenable number.

87390881609 is a deficient number, since it is larger than the sum of its proper divisors (1).

87390881609 is an equidigital number, since it uses as much as digits as its factorization.

87390881609 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5225472, while the sum is 59.

The spelling of 87390881609 in words is "eighty-seven billion, three hundred ninety million, eight hundred eighty-one thousand, six hundred nine".