1680405371 has 2 divisors, whose sum is σ = 1680405372. Its totient is φ = 1680405370.

The previous prime is 1680405347. The next prime is 1680405379. The reversal of 1680405371 is 1735040861.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1680405371 - 2²⁶ = 1613296507 is a prime.

It is not a weakly prime, because it can be changed into another prime (1680405379) 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, 840202685 + 840202686.

It is an arithmetic number, because the mean of its divisors is an integer number (840202686).

Almost surely, 2^1680405371 is an apocalyptic number.

1680405371 is a deficient number, since it is larger than the sum of its proper divisors (1).

1680405371 is an equidigital number, since it uses as much as digits as its factorization.

1680405371 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20160, while the sum is 35.

The square root of 1680405371 is about 40992.7477854315. The cubic root of 1680405371 is about 1188.8799976881.

The spelling of 1680405371 in words is "one billion, six hundred eighty million, four hundred five thousand, three hundred seventy-one".