120405311 has 4 divisors (see below), whose sum is σ = 129667272. Its totient is φ = 111143352.

The previous prime is 120405301. The next prime is 120405317. The reversal of 120405311 is 113504021.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 113504021 = 2113 ⋅53717.

It is a cyclic number.

It is not a de Polignac number, because 120405311 - 2¹⁸ = 120143167 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 120405311.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (120405317) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4630961 + ... + 4630986.

It is an arithmetic number, because the mean of its divisors is an integer number (32416818).

Almost surely, 2^120405311 is an apocalyptic number.

120405311 is a deficient number, since it is larger than the sum of its proper divisors (9261961).

120405311 is an equidigital number, since it uses as much as digits as its factorization.

120405311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9261960.

The product of its (nonzero) digits is 120, while the sum is 17.

The square root of 120405311 is about 10972.9353866684. The cubic root of 120405311 is about 493.7971146410.

Adding to 120405311 its reverse (113504021), we get a palindrome (233909332).

The spelling of 120405311 in words is "one hundred twenty million, four hundred five thousand, three hundred eleven".