85720213 has 2 divisors, whose sum is σ = 85720214. Its totient is φ = 85720212.

The previous prime is 85720211. The next prime is 85720237. The reversal of 85720213 is 31202758.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 83594449 + 2125764 = 9143^2 + 1458^2 .

It is a cyclic number.

It is not a de Polignac number, because 85720213 - 2¹ = 85720211 is a prime.

Together with 85720211, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (85720211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42860106 + 42860107.

It is an arithmetic number, because the mean of its divisors is an integer number (42860107).

Almost surely, 2^85720213 is an apocalyptic number.

It is an amenable number.

85720213 is a deficient number, since it is larger than the sum of its proper divisors (1).

85720213 is an equidigital number, since it uses as much as digits as its factorization.

85720213 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3360, while the sum is 28.

The square root of 85720213 is about 9258.5211022063. The cubic root of 85720213 is about 440.9213013208.

The spelling of 85720213 in words is "eighty-five million, seven hundred twenty thousand, two hundred thirteen".