120405811 has 2 divisors, whose sum is σ = 120405812. Its totient is φ = 120405810.

The previous prime is 120405797. The next prime is 120405821. The reversal of 120405811 is 118504021.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 120405811 - 2⁷ = 120405683 is a prime.

It is not a weakly prime, because it can be changed into another prime (120405821) 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, 60202905 + 60202906.

It is an arithmetic number, because the mean of its divisors is an integer number (60202906).

Almost surely, 2^120405811 is an apocalyptic number.

120405811 is a deficient number, since it is larger than the sum of its proper divisors (1).

120405811 is an equidigital number, since it uses as much as digits as its factorization.

120405811 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 320, while the sum is 22.

The square root of 120405811 is about 10972.9581699740. The cubic root of 120405811 is about 493.7977981607.

Adding to 120405811 its reverse (118504021), we get a palindrome (238909832).

The spelling of 120405811 in words is "one hundred twenty million, four hundred five thousand, eight hundred eleven".