181085587 has 2 divisors, whose sum is σ = 181085588. Its totient is φ = 181085586.

The previous prime is 181085563. The next prime is 181085669. The reversal of 181085587 is 785580181.

It is a happy number.

181085587 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-181085587 is a prime.

It is not a weakly prime, because it can be changed into another prime (181085687) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 90542793 + 90542794.

It is an arithmetic number, because the mean of its divisors is an integer number (90542794).

Almost surely, 2^181085587 is an apocalyptic number.

181085587 is a deficient number, since it is larger than the sum of its proper divisors (1).

181085587 is an equidigital number, since it uses as much as digits as its factorization.

181085587 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 89600, while the sum is 43.

The square root of 181085587 is about 13456.8044869501. The cubic root of 181085587 is about 565.7544280071.

The spelling of 181085587 in words is "one hundred eighty-one million, eighty-five thousand, five hundred eighty-seven".