87085081 has 2 divisors, whose sum is σ = 87085082. Its totient is φ = 87085080.

The previous prime is 87085079. The next prime is 87085099. The reversal of 87085081 is 18058078.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 79495056 + 7590025 = 8916^2 + 2755^2 .

It is a cyclic number.

It is not a de Polignac number, because 87085081 - 2¹ = 87085079 is a prime.

It is a super-2 number, since 2×87085081² = 15167622665553122, which contains 22 as substring.

Together with 87085079, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 87085081.

It is not a weakly prime, because it can be changed into another prime (87085021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43542540 + 43542541.

It is an arithmetic number, because the mean of its divisors is an integer number (43542541).

Almost surely, 2^87085081 is an apocalyptic number.

It is an amenable number.

87085081 is a deficient number, since it is larger than the sum of its proper divisors (1).

87085081 is an equidigital number, since it uses as much as digits as its factorization.

87085081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 17920, while the sum is 37.

The square root of 87085081 is about 9331.9387589075. The cubic root of 87085081 is about 443.2491587729.

The spelling of 87085081 in words is "eighty-seven million, eighty-five thousand, eighty-one".