85557161 has 2 divisors, whose sum is σ = 85557162. Its totient is φ = 85557160.

The previous prime is 85557151. The next prime is 85557271. The reversal of 85557161 is 16175558.

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., 85451536 + 105625 = 9244^2 + 325^2 .

It is a cyclic number.

It is not a de Polignac number, because 85557161 - 2⁶ = 85557097 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (85557151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42778580 + 42778581.

It is an arithmetic number, because the mean of its divisors is an integer number (42778581).

Almost surely, 2^85557161 is an apocalyptic number.

It is an amenable number.

85557161 is a deficient number, since it is larger than the sum of its proper divisors (1).

85557161 is an equidigital number, since it uses as much as digits as its factorization.

85557161 is an evil number, because the sum of its binary digits is even.

The product of its digits is 42000, while the sum is 38.

The square root of 85557161 is about 9249.7114009033. The cubic root of 85557161 is about 440.6415589304.

The spelling of 85557161 in words is "eighty-five million, five hundred fifty-seven thousand, one hundred sixty-one".