1681326511 has 16 divisors (see below), whose sum is σ = 1792224000. Its totient is φ = 1572749568.

The previous prime is 1681326487. The next prime is 1681326529. The reversal of 1681326511 is 1156231861.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1681326511 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1681326541) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1103196 + ... + 1104718.

It is an arithmetic number, because the mean of its divisors is an integer number (112014000).

Almost surely, 2^1681326511 is an apocalyptic number.

1681326511 is a deficient number, since it is larger than the sum of its proper divisors (110897489).

1681326511 is a wasteful number, since it uses less digits than its factorization.

1681326511 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2238.

The product of its digits is 8640, while the sum is 34.

The square root of 1681326511 is about 41003.9816481278. The cubic root of 1681326511 is about 1189.0971922805.

The spelling of 1681326511 in words is "one billion, six hundred eighty-one million, three hundred twenty-six thousand, five hundred eleven".