1680151217 has 2 divisors, whose sum is σ = 1680151218. Its totient is φ = 1680151216.

The previous prime is 1680151183. The next prime is 1680151309. The reversal of 1680151217 is 7121510861.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1665945856 + 14205361 = 40816^2 + 3769^2 .

It is a cyclic number.

It is not a de Polignac number, because 1680151217 - 2¹⁸ = 1679889073 is a prime.

It is a super-2 number, since 2×1680151217² = 5645816223973162178, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1680151717) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 840075608 + 840075609.

It is an arithmetic number, because the mean of its divisors is an integer number (840075609).

Almost surely, 2^1680151217 is an apocalyptic number.

It is an amenable number.

1680151217 is a deficient number, since it is larger than the sum of its proper divisors (1).

1680151217 is an equidigital number, since it uses as much as digits as its factorization.

1680151217 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3360, while the sum is 32.

The square root of 1680151217 is about 40989.6476808474. The cubic root of 1680151217 is about 1188.8200570240.

The spelling of 1680151217 in words is "one billion, six hundred eighty million, one hundred fifty-one thousand, two hundred seventeen".