87381081 has 6 divisors (see below), whose sum is σ = 126217130. Its totient is φ = 58254048.

The previous prime is 87381079. The next prime is 87381083. The reversal of 87381081 is 18018378.

It is an interprime number because it is at equal distance from previous prime (87381079) and next prime (87381083).

It can be written as a sum of positive squares in only one way, i.e., 82519056 + 4862025 = 9084^2 + 2205^2 .

It is not a de Polignac number, because 87381081 - 2¹ = 87381079 is a prime.

It is a super-2 number, since 2×87381081² = 15270906633457122, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (87381083) 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 in 5 ways as a sum of consecutive naturals, for example, 4854496 + ... + 4854513.

Almost surely, 2^87381081 is an apocalyptic number.

It is an amenable number.

87381081 is a deficient number, since it is larger than the sum of its proper divisors (38836049).

87381081 is a wasteful number, since it uses less digits than its factorization.

87381081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9709015 (or 9709012 counting only the distinct ones).

The product of its (nonzero) digits is 10752, while the sum is 36.

The square root of 87381081 is about 9347.7848178058. The cubic root of 87381081 is about 443.7507884400.

The spelling of 87381081 in words is "eighty-seven million, three hundred eighty-one thousand, eighty-one".