87171811 has 2 divisors, whose sum is σ = 87171812. Its totient is φ = 87171810.

The previous prime is 87171743. The next prime is 87171841. The reversal of 87171811 is 11817178.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 87171811 - 2⁹ = 87171299 is a prime.

It is not a weakly prime, because it can be changed into another prime (87171841) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43585905 + 43585906.

It is an arithmetic number, because the mean of its divisors is an integer number (43585906).

Almost surely, 2^87171811 is an apocalyptic number.

87171811 is a deficient number, since it is larger than the sum of its proper divisors (1).

87171811 is an equidigital number, since it uses as much as digits as its factorization.

87171811 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3136, while the sum is 34.

The square root of 87171811 is about 9336.5845468244. The cubic root of 87171811 is about 443.3962572352.

Adding to 87171811 its reverse (11817178), we get a palindrome (98988989).

The spelling of 87171811 in words is "eighty-seven million, one hundred seventy-one thousand, eight hundred eleven".