87869581 has 2 divisors, whose sum is σ = 87869582. Its totient is φ = 87869580.

The previous prime is 87869569. The next prime is 87869653. The reversal of 87869581 is 18596878.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 79655625 + 8213956 = 8925^2 + 2866^2 .

It is a cyclic number.

It is not a de Polignac number, because 87869581 - 2⁹ = 87869069 is a prime.

It is a super-2 number, since 2×87869581² = 15442126530231122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (87869501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43934790 + 43934791.

It is an arithmetic number, because the mean of its divisors is an integer number (43934791).

Almost surely, 2^87869581 is an apocalyptic number.

It is an amenable number.

87869581 is a deficient number, since it is larger than the sum of its proper divisors (1).

87869581 is an equidigital number, since it uses as much as digits as its factorization.

87869581 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 967680, while the sum is 52.

The square root of 87869581 is about 9373.8775861433. The cubic root of 87869581 is about 444.5761751857.

The spelling of 87869581 in words is "eighty-seven million, eight hundred sixty-nine thousand, five hundred eighty-one".