1659041971 has 2 divisors, whose sum is σ = 1659041972. Its totient is φ = 1659041970.

The previous prime is 1659041941. The next prime is 1659042013. The reversal of 1659041971 is 1791409561.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1659041971 - 2⁹ = 1659041459 is a prime.

It is not a weakly prime, because it can be changed into another prime (1659041921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 829520985 + 829520986.

It is an arithmetic number, because the mean of its divisors is an integer number (829520986).

Almost surely, 2^1659041971 is an apocalyptic number.

1659041971 is a deficient number, since it is larger than the sum of its proper divisors (1).

1659041971 is an equidigital number, since it uses as much as digits as its factorization.

1659041971 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 68040, while the sum is 43.

The square root of 1659041971 is about 40731.3389296252. The cubic root of 1659041971 is about 1183.8203220903.

The spelling of 1659041971 in words is "one billion, six hundred fifty-nine million, forty-one thousand, nine hundred seventy-one".