1681612837 has 2 divisors, whose sum is σ = 1681612838. Its totient is φ = 1681612836.

The previous prime is 1681612799. The next prime is 1681612847. The reversal of 1681612837 is 7382161861.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1449629476 + 231983361 = 38074^2 + 15231^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1681612837 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1681612793 and 1681612802.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1681612847) 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, 840806418 + 840806419.

It is an arithmetic number, because the mean of its divisors is an integer number (840806419).

Almost surely, 2^1681612837 is an apocalyptic number.

It is an amenable number.

1681612837 is a deficient number, since it is larger than the sum of its proper divisors (1).

1681612837 is an equidigital number, since it uses as much as digits as its factorization.

1681612837 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 96768, while the sum is 43.

The square root of 1681612837 is about 41007.4729409165. The cubic root of 1681612837 is about 1189.1646886126.

The spelling of 1681612837 in words is "one billion, six hundred eighty-one million, six hundred twelve thousand, eight hundred thirty-seven".