1680001381 has 2 divisors, whose sum is σ = 1680001382. Its totient is φ = 1680001380.

The previous prime is 1680001369. The next prime is 1680001441. The reversal of 1680001381 is 1831000861.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1073610756 + 606390625 = 32766^2 + 24625^2 .

It is a cyclic number.

It is not a de Polignac number, because 1680001381 - 2²¹ = 1677904229 is a prime.

It is a super-2 number, since 2×1680001381² = 5644809280323814322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1680001331) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 840000690 + 840000691.

It is an arithmetic number, because the mean of its divisors is an integer number (840000691).

Almost surely, 2^1680001381 is an apocalyptic number.

It is an amenable number.

1680001381 is a deficient number, since it is larger than the sum of its proper divisors (1).

1680001381 is an equidigital number, since it uses as much as digits as its factorization.

1680001381 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1152, while the sum is 28.

The square root of 1680001381 is about 40987.8199103099. The cubic root of 1680001381 is about 1188.7847162889.

The spelling of 1680001381 in words is "one billion, six hundred eighty million, one thousand, three hundred eighty-one".