85221047 has 2 divisors, whose sum is σ = 85221048. Its totient is φ = 85221046.

The previous prime is 85221043. The next prime is 85221079. The reversal of 85221047 is 74012258.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 85221047 - 2² = 85221043 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (85221041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42610523 + 42610524.

It is an arithmetic number, because the mean of its divisors is an integer number (42610524).

Almost surely, 2^85221047 is an apocalyptic number.

85221047 is a deficient number, since it is larger than the sum of its proper divisors (1).

85221047 is an equidigital number, since it uses as much as digits as its factorization.

85221047 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4480, while the sum is 29.

The square root of 85221047 is about 9231.5246303089. The cubic root of 85221047 is about 440.0637769123.

The spelling of 85221047 in words is "eighty-five million, two hundred twenty-one thousand, forty-seven".