85411721 has 2 divisors, whose sum is σ = 85411722. Its totient is φ = 85411720.

The previous prime is 85411709. The next prime is 85411759. The reversal of 85411721 is 12711458.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 83814025 + 1597696 = 9155^2 + 1264^2 .

It is a cyclic number.

It is not a de Polignac number, because 85411721 - 2¹⁰ = 85410697 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (85411021) 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, 42705860 + 42705861.

It is an arithmetic number, because the mean of its divisors is an integer number (42705861).

Almost surely, 2^85411721 is an apocalyptic number.

It is an amenable number.

85411721 is a deficient number, since it is larger than the sum of its proper divisors (1).

85411721 is an equidigital number, since it uses as much as digits as its factorization.

85411721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2240, while the sum is 29.

The square root of 85411721 is about 9241.8461900207. The cubic root of 85411721 is about 440.3917327477.

The spelling of 85411721 in words is "eighty-five million, four hundred eleven thousand, seven hundred twenty-one".