182002001981 has 2 divisors, whose sum is σ = 182002001982. Its totient is φ = 182002001980.

The previous prime is 182002001969. The next prime is 182002002001. The reversal of 182002001981 is 189100200281.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 96304708900 + 85697293081 = 310330^2 + 292741^2 .

It is a cyclic number.

It is not a de Polignac number, because 182002001981 - 2³⁰ = 180928260157 is a prime.

It is a super-2 number, since 2×182002001981² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (182002061981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 91001000990 + 91001000991.

It is an arithmetic number, because the mean of its divisors is an integer number (91001000991).

Almost surely, 2^182002001981 is an apocalyptic number.

It is an amenable number.

182002001981 is a deficient number, since it is larger than the sum of its proper divisors (1).

182002001981 is an equidigital number, since it uses as much as digits as its factorization.

182002001981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2304, while the sum is 32.

The spelling of 182002001981 in words is "one hundred eighty-two billion, two million, one thousand, nine hundred eighty-one".