1280120111 has 8 divisors (see below), whose sum is σ = 1362996720. Its totient is φ = 1198085248.

The previous prime is 1280120099. The next prime is 1280120119. The reversal of 1280120111 is 1110210821.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1280120111 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (17).

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 1280120111.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1280120119) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 207296 + ... + 213381.

It is an arithmetic number, because the mean of its divisors is an integer number (170374590).

Almost surely, 2^1280120111 is an apocalyptic number.

1280120111 is a deficient number, since it is larger than the sum of its proper divisors (82876609).

1280120111 is a wasteful number, since it uses less digits than its factorization.

1280120111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 420873.

The product of its (nonzero) digits is 32, while the sum is 17.

The square root of 1280120111 is about 35778.7662028751. The cubic root of 1280120111 is about 1085.8010071814.

Adding to 1280120111 its reverse (1110210821), we get a palindrome (2390330932).

The spelling of 1280120111 in words is "one billion, two hundred eighty million, one hundred twenty thousand, one hundred eleven".