1231201111 has 8 divisors (see below), whose sum is σ = 1408018304. Its totient is φ = 1054616760.

The previous prime is 1231201093. The next prime is 1231201123. The reversal of 1231201111 is 1111021321.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1231201111 - 2¹⁵ = 1231168343 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1231201091 and 1231201100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1231201141) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 46725 + ... + 68158.

It is an arithmetic number, because the mean of its divisors is an integer number (176002288).

Almost surely, 2^1231201111 is an apocalyptic number.

1231201111 is a deficient number, since it is larger than the sum of its proper divisors (176817193).

1231201111 is a wasteful number, since it uses less digits than its factorization.

1231201111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 116421.

The product of its (nonzero) digits is 12, while the sum is 13.

The square root of 1231201111 is about 35088.4754727247. The cubic root of 1231201111 is about 1071.7899150089.

Adding to 1231201111 its reverse (1111021321), we get a palindrome (2342222432).

The spelling of 1231201111 in words is "one billion, two hundred thirty-one million, two hundred one thousand, one hundred eleven".