85221197 has 2 divisors, whose sum is σ = 85221198. Its totient is φ = 85221196.

The previous prime is 85221107. The next prime is 85221203. The reversal of 85221197 is 79112258.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 73034116 + 12187081 = 8546^2 + 3491^2 .

It is a cyclic number.

It is not a de Polignac number, because 85221197 - 2²⁴ = 68443981 is a prime.

It is a super-2 number, since 2×85221197² = 14525304836225618, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (85221107) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42610598 + 42610599.

It is an arithmetic number, because the mean of its divisors is an integer number (42610599).

Almost surely, 2^85221197 is an apocalyptic number.

It is an amenable number.

85221197 is a deficient number, since it is larger than the sum of its proper divisors (1).

85221197 is an equidigital number, since it uses as much as digits as its factorization.

85221197 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10080, while the sum is 35.

The square root of 85221197 is about 9231.5327546405. The cubic root of 85221197 is about 440.0640351017.

The spelling of 85221197 in words is "eighty-five million, two hundred twenty-one thousand, one hundred ninety-seven".