85220749 has 2 divisors, whose sum is σ = 85220750. Its totient is φ = 85220748.

The previous prime is 85220701. The next prime is 85220753. The reversal of 85220749 is 94702258.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 66945124 + 18275625 = 8182^2 + 4275^2 .

It is a cyclic number.

It is not a de Polignac number, because 85220749 - 2¹¹ = 85218701 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (85220549) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42610374 + 42610375.

It is an arithmetic number, because the mean of its divisors is an integer number (42610375).

Almost surely, 2^85220749 is an apocalyptic number.

It is an amenable number.

85220749 is a deficient number, since it is larger than the sum of its proper divisors (1).

85220749 is an equidigital number, since it uses as much as digits as its factorization.

85220749 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 40320, while the sum is 37.

The square root of 85220749 is about 9231.5084899490. The cubic root of 85220749 is about 440.0632639750.

The spelling of 85220749 in words is "eighty-five million, two hundred twenty thousand, seven hundred forty-nine".