1200120911 has 4 divisors (see below), whose sum is σ = 1309222824. Its totient is φ = 1091019000.

The previous prime is 1200120871. The next prime is 1200120941. The reversal of 1200120911 is 1190210021.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1200120911 - 2¹⁸ = 1199858767 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 1200120911.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1200120941) 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, 54550940 + ... + 54550961.

It is an arithmetic number, because the mean of its divisors is an integer number (327305706).

Almost surely, 2^1200120911 is an apocalyptic number.

1200120911 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1200120911 is a deficient number, since it is larger than the sum of its proper divisors (109101913).

1200120911 is a wasteful number, since it uses less digits than its factorization.

1200120911 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109101912.

The product of its (nonzero) digits is 36, while the sum is 17.

The square root of 1200120911 is about 34642.7613073785. The cubic root of 1200120911 is about 1062.6942588479.

Adding to 1200120911 its reverse (1190210021), we get a palindrome (2390330932).

The spelling of 1200120911 in words is "one billion, two hundred million, one hundred twenty thousand, nine hundred eleven".