85047181 has 2 divisors, whose sum is σ = 85047182. Its totient is φ = 85047180.

The previous prime is 85047133. The next prime is 85047191. The reversal of 85047181 is 18174058.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 80910025 + 4137156 = 8995^2 + 2034^2 .

It is a cyclic number.

It is not a de Polignac number, because 85047181 - 2¹¹ = 85045133 is a prime.

It is a super-2 number, since 2×85047181² = 14466045992093522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (85047101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42523590 + 42523591.

It is an arithmetic number, because the mean of its divisors is an integer number (42523591).

Almost surely, 2^85047181 is an apocalyptic number.

It is an amenable number.

85047181 is a deficient number, since it is larger than the sum of its proper divisors (1).

85047181 is an equidigital number, since it uses as much as digits as its factorization.

85047181 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8960, while the sum is 34.

The square root of 85047181 is about 9222.1028513024. The cubic root of 85047181 is about 439.7643038629.

The spelling of 85047181 in words is "eighty-five million, forty-seven thousand, one hundred eighty-one".