87481171 has 2 divisors, whose sum is σ = 87481172. Its totient is φ = 87481170.

The previous prime is 87481169. The next prime is 87481181. The reversal of 87481171 is 17118478.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 87481171 - 2¹ = 87481169 is a prime.

Together with 87481169, it forms a pair of twin primes.

It is equal to p_5079448 and since 87481171 and 5079448 have the same sum of digits, it is a Honaker prime.

It is a self number, because there is not a number n which added to its sum of digits gives 87481171.

It is not a weakly prime, because it can be changed into another prime (87481151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43740585 + 43740586.

It is an arithmetic number, because the mean of its divisors is an integer number (43740586).

Almost surely, 2^87481171 is an apocalyptic number.

87481171 is a deficient number, since it is larger than the sum of its proper divisors (1).

87481171 is an equidigital number, since it uses as much as digits as its factorization.

87481171 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12544, while the sum is 37.

The square root of 87481171 is about 9353.1369604000. The cubic root of 87481171 is about 443.9201541212.

The spelling of 87481171 in words is "eighty-seven million, four hundred eighty-one thousand, one hundred seventy-one".