85120169 has 2 divisors, whose sum is σ = 85120170. Its totient is φ = 85120168.

The previous prime is 85120159. The next prime is 85120181. The reversal of 85120169 is 96102158.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 43388569 + 41731600 = 6587^2 + 6460^2 .

It is a cyclic number.

It is not a de Polignac number, because 85120169 - 2⁴ = 85120153 is a prime.

It is a super-2 number, since 2×85120169² = 14490886341177122, which contains 22 as substring.

It is equal to p_4950239 and since 85120169 and 4950239 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (85120109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42560084 + 42560085.

It is an arithmetic number, because the mean of its divisors is an integer number (42560085).

Almost surely, 2^85120169 is an apocalyptic number.

It is an amenable number.

85120169 is a deficient number, since it is larger than the sum of its proper divisors (1).

85120169 is an equidigital number, since it uses as much as digits as its factorization.

85120169 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4320, while the sum is 32.

The square root of 85120169 is about 9226.0592345811. The cubic root of 85120169 is about 439.8900706781.

The spelling of 85120169 in words is "eighty-five million, one hundred twenty thousand, one hundred sixty-nine".