87215171 has 2 divisors, whose sum is σ = 87215172. Its totient is φ = 87215170.

The previous prime is 87215153. The next prime is 87215189. The reversal of 87215171 is 17151278.

It is a balanced prime because it is at equal distance from previous prime (87215153) and next prime (87215189).

It is a cyclic number.

It is not a de Polignac number, because 87215171 - 2²² = 83020867 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (87215371) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43607585 + 43607586.

It is an arithmetic number, because the mean of its divisors is an integer number (43607586).

Almost surely, 2^87215171 is an apocalyptic number.

87215171 is a deficient number, since it is larger than the sum of its proper divisors (1).

87215171 is an equidigital number, since it uses as much as digits as its factorization.

87215171 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3920, while the sum is 32.

The square root of 87215171 is about 9338.9063064151. The cubic root of 87215171 is about 443.4697614055.

The spelling of 87215171 in words is "eighty-seven million, two hundred fifteen thousand, one hundred seventy-one".