803729981 has 2 divisors, whose sum is σ = 803729982. Its totient is φ = 803729980.

The previous prime is 803729959. The next prime is 803729987. The reversal of 803729981 is 189927308.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 743434756 + 60295225 = 27266^2 + 7765^2 .

It is a cyclic number.

It is not a de Polignac number, because 803729981 - 2¹⁰ = 803728957 is a prime.

It is a super-2 number, since 2×803729981² = 1291963764716520722, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (803729987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 401864990 + 401864991.

It is an arithmetic number, because the mean of its divisors is an integer number (401864991).

Almost surely, 2^803729981 is an apocalyptic number.

It is an amenable number.

803729981 is a deficient number, since it is larger than the sum of its proper divisors (1).

803729981 is an equidigital number, since it uses as much as digits as its factorization.

803729981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 217728, while the sum is 47.

The square root of 803729981 is about 28350.1319397283. The cubic root of 803729981 is about 929.7582834251.

The spelling of 803729981 in words is "eight hundred three million, seven hundred twenty-nine thousand, nine hundred eighty-one".