1200111231 has 16 divisors (see below), whose sum is σ = 1837491840. Its totient is φ = 689058720.

The previous prime is 1200111229. The next prime is 1200111239. The reversal of 1200111231 is 1321110021.

It is not a de Polignac number, because 1200111231 - 2¹ = 1200111229 is a prime.

It is a super-2 number, since 2×1200111231² = 2880533933544670722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1200111239) 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, 956400 + ... + 957653.

It is an arithmetic number, because the mean of its divisors is an integer number (114843240).

Almost surely, 2^1200111231 is an apocalyptic number.

1200111231 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1200111231 is a deficient number, since it is larger than the sum of its proper divisors (637380609).

1200111231 is a wasteful number, since it uses less digits than its factorization.

1200111231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1914086.

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

The square root of 1200111231 is about 34642.6215953701. The cubic root of 1200111231 is about 1062.6914016613.

Adding to 1200111231 its reverse (1321110021), we get a palindrome (2521221252).

It can be divided in two parts, 12001 and 11231, that added together give a palindrome (23232).

The spelling of 1200111231 in words is "one billion, two hundred million, one hundred eleven thousand, two hundred thirty-one".