120400081 has 2 divisors, whose sum is σ = 120400082. Its totient is φ = 120400080.

The previous prime is 120400079. The next prime is 120400117. The reversal of 120400081 is 180004021.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 112699456 + 7700625 = 10616^2 + 2775^2 .

It is a cyclic number.

It is not a de Polignac number, because 120400081 - 2¹ = 120400079 is a prime.

It is a super-2 number, since 2×120400081² = 28992359009613122, which contains 22 as substring.

Together with 120400079, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (120400051) 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, 60200040 + 60200041.

It is an arithmetic number, because the mean of its divisors is an integer number (60200041).

Almost surely, 2^120400081 is an apocalyptic number.

It is an amenable number.

120400081 is a deficient number, since it is larger than the sum of its proper divisors (1).

120400081 is an equidigital number, since it uses as much as digits as its factorization.

120400081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 64, while the sum is 16.

The square root of 120400081 is about 10972.6970704563. The cubic root of 120400081 is about 493.7899649112.

The spelling of 120400081 in words is "one hundred twenty million, four hundred thousand, eighty-one".