85981177 has 2 divisors, whose sum is σ = 85981178. Its totient is φ = 85981176.

The previous prime is 85981171. The next prime is 85981187. The reversal of 85981177 is 77118958.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 64256256 + 21724921 = 8016^2 + 4661^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-85981177 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (85981171) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42990588 + 42990589.

It is an arithmetic number, because the mean of its divisors is an integer number (42990589).

Almost surely, 2^85981177 is an apocalyptic number.

It is an amenable number.

85981177 is a deficient number, since it is larger than the sum of its proper divisors (1).

85981177 is an equidigital number, since it uses as much as digits as its factorization.

85981177 is an evil number, because the sum of its binary digits is even.

The product of its digits is 141120, while the sum is 46.

The square root of 85981177 is about 9272.6035718130. The cubic root of 85981177 is about 441.3682904776.

The spelling of 85981177 in words is "eighty-five million, nine hundred eighty-one thousand, one hundred seventy-seven".