87431171 has 2 divisors, whose sum is σ = 87431172. Its totient is φ = 87431170.

The previous prime is 87431167. The next prime is 87431173. The reversal of 87431171 is 17113478.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 87431171 - 2² = 87431167 is a prime.

Together with 87431173, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (87431173) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43715585 + 43715586.

It is an arithmetic number, because the mean of its divisors is an integer number (43715586).

Almost surely, 2^87431171 is an apocalyptic number.

87431171 is a deficient number, since it is larger than the sum of its proper divisors (1).

87431171 is an equidigital number, since it uses as much as digits as its factorization.

87431171 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4704, while the sum is 32.

The square root of 87431171 is about 9350.4636783424. The cubic root of 87431171 is about 443.8355635839.

The spelling of 87431171 in words is "eighty-seven million, four hundred thirty-one thousand, one hundred seventy-one".