85215649 has 2 divisors, whose sum is σ = 85215650. Its totient is φ = 85215648.

The previous prime is 85215643. The next prime is 85215661. The reversal of 85215649 is 94651258.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 63760225 + 21455424 = 7985^2 + 4632^2 .

It is a cyclic number.

It is not a de Polignac number, because 85215649 - 2⁵ = 85215617 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (85215643) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42607824 + 42607825.

It is an arithmetic number, because the mean of its divisors is an integer number (42607825).

Almost surely, 2^85215649 is an apocalyptic number.

It is an amenable number.

85215649 is a deficient number, since it is larger than the sum of its proper divisors (1).

85215649 is an equidigital number, since it uses as much as digits as its factorization.

85215649 is an evil number, because the sum of its binary digits is even.

The product of its digits is 86400, while the sum is 40.

The square root of 85215649 is about 9231.2322579383. The cubic root of 85215649 is about 440.0544853327.

The spelling of 85215649 in words is "eighty-five million, two hundred fifteen thousand, six hundred forty-nine".