87155171 has 2 divisors, whose sum is σ = 87155172. Its totient is φ = 87155170.

The previous prime is 87155149. The next prime is 87155177. The reversal of 87155171 is 17155178.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 87155171 - 2¹⁰ = 87154147 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (87155177) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43577585 + 43577586.

It is an arithmetic number, because the mean of its divisors is an integer number (43577586).

Almost surely, 2^87155171 is an apocalyptic number.

87155171 is a deficient number, since it is larger than the sum of its proper divisors (1).

87155171 is an equidigital number, since it uses as much as digits as its factorization.

87155171 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9800, while the sum is 35.

The square root of 87155171 is about 9335.6933861390. The cubic root of 87155171 is about 443.3680425209.

The spelling of 87155171 in words is "eighty-seven million, one hundred fifty-five thousand, one hundred seventy-one".