311431121 has 4 divisors (see below), whose sum is σ = 319027044. Its totient is φ = 303835200.

The previous prime is 311431117. The next prime is 311431123. The reversal of 311431121 is 121134113.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 121134113 = 8599 ⋅14087.

It can be written as a sum of positive squares in 2 ways, for example, as 65286400 + 246144721 = 8080^2 + 15689^2 .

It is a cyclic number.

It is not a de Polignac number, because 311431121 - 2² = 311431117 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 311431121.

It is not an unprimeable number, because it can be changed into a prime (311431123) 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, 3797900 + ... + 3797981.

It is an arithmetic number, because the mean of its divisors is an integer number (79756761).

Almost surely, 2^311431121 is an apocalyptic number.

It is an amenable number.

311431121 is a deficient number, since it is larger than the sum of its proper divisors (7595923).

311431121 is an equidigital number, since it uses as much as digits as its factorization.

311431121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7595922.

The product of its digits is 72, while the sum is 17.

The square root of 311431121 is about 17647.4111699138. The cubic root of 311431121 is about 677.8298179448.

Adding to 311431121 its reverse (121134113), we get a palindrome (432565234).

The spelling of 311431121 in words is "three hundred eleven million, four hundred thirty-one thousand, one hundred twenty-one".