87661081 has 2 divisors, whose sum is σ = 87661082. Its totient is φ = 87661080.

The previous prime is 87661051. The next prime is 87661109. The reversal of 87661081 is 18016678.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 63059481 + 24601600 = 7941^2 + 4960^2 .

It is a cyclic number.

It is not a de Polignac number, because 87661081 - 2⁷ = 87660953 is a prime.

It is a super-2 number, since 2×87661081² = 15368930244177122, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 87661081.

It is not a weakly prime, because it can be changed into another prime (87661051) 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, 43830540 + 43830541.

It is an arithmetic number, because the mean of its divisors is an integer number (43830541).

Almost surely, 2^87661081 is an apocalyptic number.

It is an amenable number.

87661081 is a deficient number, since it is larger than the sum of its proper divisors (1).

87661081 is an equidigital number, since it uses as much as digits as its factorization.

87661081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16128, while the sum is 37.

The square root of 87661081 is about 9362.7496495421. The cubic root of 87661081 is about 444.2242614205.

The spelling of 87661081 in words is "eighty-seven million, six hundred sixty-one thousand, eighty-one".