181087 has 2 divisors, whose sum is σ = 181088. Its totient is φ = 181086.

The previous prime is 181081. The next prime is 181123. The reversal of 181087 is 780181.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 181087 - 2⁷ = 180959 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (181081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 90543 + 90544.

It is an arithmetic number, because the mean of its divisors is an integer number (90544).

2¹⁸¹⁰⁸⁷ is an apocalyptic number.

181087 is a deficient number, since it is larger than the sum of its proper divisors (1).

181087 is an equidigital number, since it uses as much as digits as its factorization.

181087 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 448, while the sum is 25.

The square root of 181087 is about 425.5431822976. The cubic root of 181087 is about 56.5755899519.

It can be divided in two parts, 18108 and 7, that multiplied together give a triangular number (126756 = T₅₀₃).

The spelling of 181087 in words is "one hundred eighty-one thousand, eighty-seven".