1312201111 has 4 divisors (see below), whose sum is σ = 1413139672. Its totient is φ = 1211262552.

The previous prime is 1312201081. The next prime is 1312201127. The reversal of 1312201111 is 1111022131.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 1312201111 - 2⁷ = 1312200983 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (13), and also a Moran number because the ratio is a prime number: 100938547 = 1312201111 / (1 + 3 + 1 + 2 + 2 + 0 + 1 + 1 + 1 + 1).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1312201091 and 1312201100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1312201171) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 50469261 + ... + 50469286.

It is an arithmetic number, because the mean of its divisors is an integer number (353284918).

Almost surely, 2^1312201111 is an apocalyptic number.

1312201111 is a deficient number, since it is larger than the sum of its proper divisors (100938561).

1312201111 is a wasteful number, since it uses less digits than its factorization.

1312201111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 100938560.

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

The square root of 1312201111 is about 36224.3165705027. The cubic root of 1312201111 is about 1094.7966681801.

Adding to 1312201111 its reverse (1111022131), we get a palindrome (2423223242).

The spelling of 1312201111 in words is "one billion, three hundred twelve million, two hundred one thousand, one hundred eleven".