85215313 has 2 divisors, whose sum is σ = 85215314. Its totient is φ = 85215312.

The previous prime is 85215301. The next prime is 85215337. The reversal of 85215313 is 31351258.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 79869969 + 5345344 = 8937^2 + 2312^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-85215313 is a prime.

It is not a weakly prime, because it can be changed into another prime (85210313) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42607656 + 42607657.

It is an arithmetic number, because the mean of its divisors is an integer number (42607657).

Almost surely, 2^85215313 is an apocalyptic number.

It is an amenable number.

85215313 is a deficient number, since it is larger than the sum of its proper divisors (1).

85215313 is an equidigital number, since it uses as much as digits as its factorization.

85215313 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3600, while the sum is 28.

The square root of 85215313 is about 9231.2140588332. The cubic root of 85215313 is about 440.0539069628.

The spelling of 85215313 in words is "eighty-five million, two hundred fifteen thousand, three hundred thirteen".