85564397 has 2 divisors, whose sum is σ = 85564398. Its totient is φ = 85564396.

The previous prime is 85564363. The next prime is 85564403. The reversal of 85564397 is 79346558.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 53085796 + 32478601 = 7286^2 + 5699^2 .

It is a cyclic number.

It is not a de Polignac number, because 85564397 - 2²⁶ = 18455533 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (85564307) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42782198 + 42782199.

It is an arithmetic number, because the mean of its divisors is an integer number (42782199).

Almost surely, 2^85564397 is an apocalyptic number.

It is an amenable number.

85564397 is a deficient number, since it is larger than the sum of its proper divisors (1).

85564397 is an equidigital number, since it uses as much as digits as its factorization.

85564397 is an evil number, because the sum of its binary digits is even.

The product of its digits is 907200, while the sum is 47.

The square root of 85564397 is about 9250.1025399722. The cubic root of 85564397 is about 440.6539810055.

The spelling of 85564397 in words is "eighty-five million, five hundred sixty-four thousand, three hundred ninety-seven".