1200023111 has 4 divisors (see below), whose sum is σ = 1371454992. Its totient is φ = 1028591232.

The previous prime is 1200023093. The next prime is 1200023119. The reversal of 1200023111 is 1113200021.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1200023111 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1200023092 and 1200023101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1200023119) 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, 85715930 + ... + 85715943.

It is an arithmetic number, because the mean of its divisors is an integer number (342863748).

Almost surely, 2^1200023111 is an apocalyptic number.

1200023111 is a deficient number, since it is larger than the sum of its proper divisors (171431881).

1200023111 is an equidigital number, since it uses as much as digits as its factorization.

1200023111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 171431880.

The product of its (nonzero) digits is 12, while the sum is 11.

The square root of 1200023111 is about 34641.3497283232. The cubic root of 1200023111 is about 1062.6653911116.

Adding to 1200023111 its reverse (1113200021), we get a palindrome (2313223132).

The spelling of 1200023111 in words is "one billion, two hundred million, twenty-three thousand, one hundred eleven".