87982161 has 4 divisors (see below), whose sum is σ = 117309552. Its totient is φ = 58654772.

The previous prime is 87982159. The next prime is 87982229. The reversal of 87982161 is 16128978.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 87982161 - 2¹ = 87982159 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (87980161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14663691 + ... + 14663696.

It is an arithmetic number, because the mean of its divisors is an integer number (29327388).

Almost surely, 2^87982161 is an apocalyptic number.

It is an amenable number.

87982161 is a deficient number, since it is larger than the sum of its proper divisors (29327391).

87982161 is a wasteful number, since it uses less digits than its factorization.

87982161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29327390.

The product of its digits is 48384, while the sum is 42.

The square root of 87982161 is about 9379.8806495605. The cubic root of 87982161 is about 444.7659603397.

The spelling of 87982161 in words is "eighty-seven million, nine hundred eighty-two thousand, one hundred sixty-one".