85219987 has 2 divisors, whose sum is σ = 85219988. Its totient is φ = 85219986.

The previous prime is 85219949. The next prime is 85219993. The reversal of 85219987 is 78991258.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 85219987 - 2⁷ = 85219859 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 85219987.

It is not a weakly prime, because it can be changed into another prime (85219087) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42609993 + 42609994.

It is an arithmetic number, because the mean of its divisors is an integer number (42609994).

Almost surely, 2^85219987 is an apocalyptic number.

85219987 is a deficient number, since it is larger than the sum of its proper divisors (1).

85219987 is an equidigital number, since it uses as much as digits as its factorization.

85219987 is an evil number, because the sum of its binary digits is even.

The product of its digits is 362880, while the sum is 49.

The square root of 85219987 is about 9231.4672181620. The cubic root of 85219987 is about 440.0619523648.

The spelling of 85219987 in words is "eighty-five million, two hundred nineteen thousand, nine hundred eighty-seven".