1755761981 has 2 divisors, whose sum is σ = 1755761982. Its totient is φ = 1755761980.

The previous prime is 1755761977. The next prime is 1755762031. The reversal of 1755761981 is 1891675571.

It is an a-pointer prime, because the next prime (1755762031) can be obtained adding 1755761981 to its sum of digits (50).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1669457881 + 86304100 = 40859^2 + 9290^2 .

It is a cyclic number.

It is not a de Polignac number, because 1755761981 - 2² = 1755761977 is a prime.

It is a super-2 number, since 2×1755761981² = 6165400267850088722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1755761951) 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, 877880990 + 877880991.

It is an arithmetic number, because the mean of its divisors is an integer number (877880991).

Almost surely, 2^1755761981 is an apocalyptic number.

It is an amenable number.

1755761981 is a deficient number, since it is larger than the sum of its proper divisors (1).

1755761981 is an equidigital number, since it uses as much as digits as its factorization.

1755761981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 529200, while the sum is 50.

The square root of 1755761981 is about 41901.8135765029. The cubic root of 1755761981 is about 1206.3922730663.

The spelling of 1755761981 in words is "one billion, seven hundred fifty-five million, seven hundred sixty-one thousand, nine hundred eighty-one".