1200123111 has 16 divisors (see below), whose sum is σ = 1746603648. Its totient is φ = 726943200.

The previous prime is 1200123103. The next prime is 1200123131. The reversal of 1200123111 is 1113210021.

1200123111 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 1200123111 - 2³ = 1200123103 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1200123131) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 56796 + ... + 75006.

It is an arithmetic number, because the mean of its divisors is an integer number (109162728).

Almost surely, 2^1200123111 is an apocalyptic number.

1200123111 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1200123111 is a deficient number, since it is larger than the sum of its proper divisors (546480537).

1200123111 is a wasteful number, since it uses less digits than its factorization.

1200123111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20222.

The product of its (nonzero) digits is 12, while the sum is 12.

The square root of 1200123111 is about 34642.7930600291. The cubic root of 1200123111 is about 1062.6949082064.

Adding to 1200123111 its reverse (1113210021), we get a palindrome (2313333132).

The spelling of 1200123111 in words is "one billion, two hundred million, one hundred twenty-three thousand, one hundred eleven".