85782149 has 2 divisors, whose sum is σ = 85782150. Its totient is φ = 85782148.

The previous prime is 85782133. The next prime is 85782161. The reversal of 85782149 is 94128758.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 48205249 + 37576900 = 6943^2 + 6130^2 .

It is a cyclic number.

It is not a de Polignac number, because 85782149 - 2⁴ = 85782133 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (85782199) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42891074 + 42891075.

It is an arithmetic number, because the mean of its divisors is an integer number (42891075).

Almost surely, 2^85782149 is an apocalyptic number.

It is an amenable number.

85782149 is a deficient number, since it is larger than the sum of its proper divisors (1).

85782149 is an equidigital number, since it uses as much as digits as its factorization.

85782149 is an evil number, because the sum of its binary digits is even.

The product of its digits is 161280, while the sum is 44.

The square root of 85782149 is about 9261.8653088889. The cubic root of 85782149 is about 441.0274696957.

The spelling of 85782149 in words is "eighty-five million, seven hundred eighty-two thousand, one hundred forty-nine".