1701989981 has 2 divisors, whose sum is σ = 1701989982. Its totient is φ = 1701989980.

The previous prime is 1701989957. The next prime is 1701990029. The reversal of 1701989981 is 1899891071.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1351738756 + 350251225 = 36766^2 + 18715^2 .

It is a cyclic number.

It is not a de Polignac number, because 1701989981 - 2²² = 1697795677 is a prime.

It is a super-2 number, since 2×1701989981² = 5793539790848760722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1701989951) 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 as a sum of consecutive naturals, namely, 850994990 + 850994991.

It is an arithmetic number, because the mean of its divisors is an integer number (850994991).

Almost surely, 2^1701989981 is an apocalyptic number.

It is an amenable number.

1701989981 is a deficient number, since it is larger than the sum of its proper divisors (1).

1701989981 is an equidigital number, since it uses as much as digits as its factorization.

1701989981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 326592, while the sum is 53.

The square root of 1701989981 is about 41255.1812624790. The cubic root of 1701989981 is about 1193.9486983524.

The spelling of 1701989981 in words is "one billion, seven hundred one million, nine hundred eighty-nine thousand, nine hundred eighty-one".