920785171 has 2 divisors, whose sum is σ = 920785172. Its totient is φ = 920785170.

The previous prime is 920785153. The next prime is 920785181. The reversal of 920785171 is 171587029.

It is a strong prime.

It is an emirp because it is prime and its reverse (171587029) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 920785171 - 2⁹ = 920784659 is a prime.

It is a super-2 number, since 2×920785171² = 1695690662266998482, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (920785141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 460392585 + 460392586.

It is an arithmetic number, because the mean of its divisors is an integer number (460392586).

Almost surely, 2^920785171 is an apocalyptic number.

920785171 is a deficient number, since it is larger than the sum of its proper divisors (1).

920785171 is an equidigital number, since it uses as much as digits as its factorization.

920785171 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 35280, while the sum is 40.

The square root of 920785171 is about 30344.4421764514. The cubic root of 920785171 is about 972.8654317985.

The spelling of 920785171 in words is "nine hundred twenty million, seven hundred eighty-five thousand, one hundred seventy-one".