120420991 has 2 divisors, whose sum is σ = 120420992. Its totient is φ = 120420990.

The previous prime is 120420983. The next prime is 120421001. The reversal of 120420991 is 199024021.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 120420991 - 2³ = 120420983 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (120420931) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60210495 + 60210496.

It is an arithmetic number, because the mean of its divisors is an integer number (60210496).

Almost surely, 2^120420991 is an apocalyptic number.

120420991 is a deficient number, since it is larger than the sum of its proper divisors (1).

120420991 is an equidigital number, since it uses as much as digits as its factorization.

120420991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1296, while the sum is 28.

The square root of 120420991 is about 10973.6498486146. The cubic root of 120420991 is about 493.8185489188.

The spelling of 120420991 in words is "one hundred twenty million, four hundred twenty thousand, nine hundred ninety-one".