85172141 has 2 divisors, whose sum is σ = 85172142. Its totient is φ = 85172140.

The previous prime is 85172099. The next prime is 85172147. The reversal of 85172141 is 14127158.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 72420100 + 12752041 = 8510^2 + 3571^2 .

It is a cyclic number.

It is not a de Polignac number, because 85172141 - 2⁶ = 85172077 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (85172147) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42586070 + 42586071.

It is an arithmetic number, because the mean of its divisors is an integer number (42586071).

Almost surely, 2^85172141 is an apocalyptic number.

It is an amenable number.

85172141 is a deficient number, since it is larger than the sum of its proper divisors (1).

85172141 is an equidigital number, since it uses as much as digits as its factorization.

85172141 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2240, while the sum is 29.

The square root of 85172141 is about 9228.8753919424. The cubic root of 85172141 is about 439.9795806640.

Adding to 85172141 its reverse (14127158), we get a palindrome (99299299).

The spelling of 85172141 in words is "eighty-five million, one hundred seventy-two thousand, one hundred forty-one".