1200231111 has 4 divisors (see below), whose sum is σ = 1600308152. Its totient is φ = 800154072.

The previous prime is 1200231101. The next prime is 1200231113. The reversal of 1200231111 is 1111320021.

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

It is not a de Polignac number, because 1200231111 - 2²⁹ = 663360199 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1200231113) 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, 200038516 + ... + 200038521.

It is an arithmetic number, because the mean of its divisors is an integer number (400077038).

Almost surely, 2^1200231111 is an apocalyptic number.

1200231111 is a deficient number, since it is larger than the sum of its proper divisors (400077041).

1200231111 is an equidigital number, since it uses as much as digits as its factorization.

1200231111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 400077040.

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

The square root of 1200231111 is about 34644.3517907321. The cubic root of 1200231111 is about 1062.7267848270.

Adding to 1200231111 its reverse (1111320021), we get a palindrome (2311551132).

The spelling of 1200231111 in words is "one billion, two hundred million, two hundred thirty-one thousand, one hundred eleven".