87185143 has 2 divisors, whose sum is σ = 87185144. Its totient is φ = 87185142.

The previous prime is 87185099. The next prime is 87185149. The reversal of 87185143 is 34158178.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 87185143 - 2¹³ = 87176951 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (87185149) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43592571 + 43592572.

It is an arithmetic number, because the mean of its divisors is an integer number (43592572).

Almost surely, 2^87185143 is an apocalyptic number.

87185143 is a deficient number, since it is larger than the sum of its proper divisors (1).

87185143 is an equidigital number, since it uses as much as digits as its factorization.

87185143 is an evil number, because the sum of its binary digits is even.

The product of its digits is 26880, while the sum is 37.

The square root of 87185143 is about 9337.2984851080. The cubic root of 87185143 is about 443.4188603279.

It can be divided in two parts, 8718 and 5143, that added together give a triangular number (13861 = T₁₆₆).

The spelling of 87185143 in words is "eighty-seven million, one hundred eighty-five thousand, one hundred forty-three".