311141221 has 4 divisors (see below), whose sum is σ = 311382412. Its totient is φ = 310900032.

The previous prime is 311141219. The next prime is 311141231. The reversal of 311141221 is 122141113.

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

It can be written as a sum of positive squares in 2 ways, for example, as 298080225 + 13060996 = 17265^2 + 3614^2 .

It is a cyclic number.

It is not a de Polignac number, because 311141221 - 2¹ = 311141219 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 311141195 and 311141204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (311141231) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 118650 + ... + 121243.

It is an arithmetic number, because the mean of its divisors is an integer number (77845603).

Almost surely, 2^311141221 is an apocalyptic number.

It is an amenable number.

311141221 is a deficient number, since it is larger than the sum of its proper divisors (241191).

311141221 is a wasteful number, since it uses less digits than its factorization.

311141221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 241190.

The product of its digits is 48, while the sum is 16.

The square root of 311141221 is about 17639.1955882347. The cubic root of 311141221 is about 677.6194302057.

Adding to 311141221 its reverse (122141113), we get a palindrome (433282334).

The spelling of 311141221 in words is "three hundred eleven million, one hundred forty-one thousand, two hundred twenty-one".