85181587 has 2 divisors, whose sum is σ = 85181588. Its totient is φ = 85181586.

The previous prime is 85181557. The next prime is 85181639. The reversal of 85181587 is 78518158.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 85181587 - 2¹⁹ = 84657299 is a prime.

It is not a weakly prime, because it can be changed into another prime (85181527) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42590793 + 42590794.

It is an arithmetic number, because the mean of its divisors is an integer number (42590794).

Almost surely, 2^85181587 is an apocalyptic number.

85181587 is a deficient number, since it is larger than the sum of its proper divisors (1).

85181587 is an equidigital number, since it uses as much as digits as its factorization.

85181587 is an evil number, because the sum of its binary digits is even.

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

The square root of 85181587 is about 9229.3871410836. The cubic root of 85181587 is about 439.9958453464.

The spelling of 85181587 in words is "eighty-five million, one hundred eighty-one thousand, five hundred eighty-seven".