311112121 has 8 divisors (see below), whose sum is σ = 330699240. Its totient is φ = 291667968.

The previous prime is 311112119. The next prime is 311112127. The reversal of 311112121 is 121211113.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 77633721 + 233478400 = 8811^2 + 15280^2 .

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 311112121 - 2¹ = 311112119 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (311112127) 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, 31236 + ... + 39973.

It is an arithmetic number, because the mean of its divisors is an integer number (41337405).

Almost surely, 2^311112121 is an apocalyptic number.

It is an amenable number.

311112121 is a deficient number, since it is larger than the sum of its proper divisors (19587119).

311112121 is a wasteful number, since it uses less digits than its factorization.

311112121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71483.

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

The square root of 311112121 is about 17638.3707013998. The cubic root of 311112121 is about 677.5983043858.

Adding to 311112121 its reverse (121211113), we get a palindrome (432323234).

The spelling of 311112121 in words is "three hundred eleven million, one hundred twelve thousand, one hundred twenty-one".