1021640171 has 2 divisors, whose sum is σ = 1021640172. Its totient is φ = 1021640170.

The previous prime is 1021640161. The next prime is 1021640209. The reversal of 1021640171 is 1710461201.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1021640171 - 2¹⁰ = 1021639147 is a prime.

It is not a weakly prime, because it can be changed into another prime (1021640141) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 510820085 + 510820086.

It is an arithmetic number, because the mean of its divisors is an integer number (510820086).

Almost surely, 2^1021640171 is an apocalyptic number.

1021640171 is a deficient number, since it is larger than the sum of its proper divisors (1).

1021640171 is an equidigital number, since it uses as much as digits as its factorization.

1021640171 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 336, while the sum is 23.

The square root of 1021640171 is about 31963.1064041028. The cubic root of 1021640171 is about 1007.1619740065.

The spelling of 1021640171 in words is "one billion, twenty-one million, six hundred forty thousand, one hundred seventy-one".