820451171 has 2 divisors, whose sum is σ = 820451172. Its totient is φ = 820451170.

The previous prime is 820451131. The next prime is 820451189. The reversal of 820451171 is 171154028.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 820451171 - 2¹⁴ = 820434787 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (820451111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 410225585 + 410225586.

It is an arithmetic number, because the mean of its divisors is an integer number (410225586).

Almost surely, 2^820451171 is an apocalyptic number.

820451171 is a deficient number, since it is larger than the sum of its proper divisors (1).

820451171 is an equidigital number, since it uses as much as digits as its factorization.

820451171 is an evil number, because the sum of its binary digits is even.

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

The square root of 820451171 is about 28643.5188306186. The cubic root of 820451171 is about 936.1617940994.

The spelling of 820451171 in words is "eight hundred twenty million, four hundred fifty-one thousand, one hundred seventy-one".