85171363309 has 2 divisors, whose sum is σ = 85171363310. Its totient is φ = 85171363308.

The previous prime is 85171363267. The next prime is 85171363313. The reversal of 85171363309 is 90336317158.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 77933097225 + 7238266084 = 279165^2 + 85078^2 .

It is a cyclic number.

It is not a de Polignac number, because 85171363309 - 2⁹ = 85171362797 is a prime.

It is a super-2 number, since 2×85171363309² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (85171363369) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42585681654 + 42585681655.

It is an arithmetic number, because the mean of its divisors is an integer number (42585681655).

Almost surely, 2^85171363309 is an apocalyptic number.

It is an amenable number.

85171363309 is a deficient number, since it is larger than the sum of its proper divisors (1).

85171363309 is an equidigital number, since it uses as much as digits as its factorization.

85171363309 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 408240, while the sum is 46.

The spelling of 85171363309 in words is "eighty-five billion, one hundred seventy-one million, three hundred sixty-three thousand, three hundred nine".