85570987 has 2 divisors, whose sum is σ = 85570988. Its totient is φ = 85570986.

The previous prime is 85570957. The next prime is 85570997. The reversal of 85570987 is 78907558.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 85570987 - 2²³ = 77182379 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 85570987.

It is not a weakly prime, because it can be changed into another prime (85570907) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42785493 + 42785494.

It is an arithmetic number, because the mean of its divisors is an integer number (42785494).

Almost surely, 2^85570987 is an apocalyptic number.

85570987 is a deficient number, since it is larger than the sum of its proper divisors (1).

85570987 is an equidigital number, since it uses as much as digits as its factorization.

85570987 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 705600, while the sum is 49.

The square root of 85570987 is about 9250.4587453812. The cubic root of 85570987 is about 440.6652934800.

The spelling of 85570987 in words is "eighty-five million, five hundred seventy thousand, nine hundred eighty-seven".