1681767361 has 4 divisors (see below), whose sum is σ = 1696650372. Its totient is φ = 1666884352.

The previous prime is 1681767359. The next prime is 1681767371. The reversal of 1681767361 is 1637671861.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1637671861 = 7 ⋅233953123.

It can be written as a sum of positive squares in 2 ways, for example, as 900900225 + 780867136 = 30015^2 + 27944^2 .

It is a cyclic number.

It is not a de Polignac number, because 1681767361 - 2¹ = 1681767359 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1681767371) 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 in 3 ways as a sum of consecutive naturals, for example, 7441336 + ... + 7441561.

It is an arithmetic number, because the mean of its divisors is an integer number (424162593).

Almost surely, 2^1681767361 is an apocalyptic number.

It is an amenable number.

1681767361 is a deficient number, since it is larger than the sum of its proper divisors (14883011).

1681767361 is a wasteful number, since it uses less digits than its factorization.

1681767361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14883010.

The product of its digits is 254016, while the sum is 46.

The square root of 1681767361 is about 41009.3569932522. The cubic root of 1681767361 is about 1189.2011117519.

The spelling of 1681767361 in words is "one billion, six hundred eighty-one million, seven hundred sixty-seven thousand, three hundred sixty-one".