1331220111 has 8 divisors (see below), whose sum is σ = 1911495600. Its totient is φ = 819212352.

The previous prime is 1331220083. The next prime is 1331220157. The reversal of 1331220111 is 1110221331.

It is a happy number.

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

It is not a de Polignac number, because 1331220111 - 2¹⁹ = 1330695823 is a prime.

It is a super-3 number, since 3×1331220111³ (a number of 28 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1331220181) 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, 17066886 + ... + 17066963.

It is an arithmetic number, because the mean of its divisors is an integer number (238936950).

Almost surely, 2^1331220111 is an apocalyptic number.

1331220111 is a deficient number, since it is larger than the sum of its proper divisors (580275489).

1331220111 is a wasteful number, since it uses less digits than its factorization.

1331220111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34133865.

The product of its (nonzero) digits is 36, while the sum is 15.

The square root of 1331220111 is about 36485.8892039101. The cubic root of 1331220111 is about 1100.0606332969.

Adding to 1331220111 its reverse (1110221331), we get a palindrome (2441441442).

It can be divided in two parts, 1331220 and 111, that added together give a palindrome (1331331).

The spelling of 1331220111 in words is "one billion, three hundred thirty-one million, two hundred twenty thousand, one hundred eleven".