85175557 has 2 divisors, whose sum is σ = 85175558. Its totient is φ = 85175556.

The previous prime is 85175549. The next prime is 85175567. The reversal of 85175557 is 75557158.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 50495236 + 34680321 = 7106^2 + 5889^2 .

It is a cyclic number.

It is not a de Polignac number, because 85175557 - 2³ = 85175549 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (85175567) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42587778 + 42587779.

It is an arithmetic number, because the mean of its divisors is an integer number (42587779).

Almost surely, 2^85175557 is an apocalyptic number.

It is an amenable number.

85175557 is a deficient number, since it is larger than the sum of its proper divisors (1).

85175557 is an equidigital number, since it uses as much as digits as its factorization.

85175557 is an evil number, because the sum of its binary digits is even.

The product of its digits is 245000, while the sum is 43.

The square root of 85175557 is about 9229.0604613904. The cubic root of 85175557 is about 439.9854626740.

The spelling of 85175557 in words is "eighty-five million, one hundred seventy-five thousand, five hundred fifty-seven".