311331121 has 2 divisors, whose sum is σ = 311331122. Its totient is φ = 311331120.

The previous prime is 311331107. The next prime is 311331127. The reversal of 311331121 is 121133113.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 304014096 + 7317025 = 17436^2 + 2705^2 .

It is a cyclic number.

It is not a de Polignac number, because 311331121 - 2⁹ = 311330609 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 311331095 and 311331104.

It is not a weakly prime, because it can be changed into another prime (311331127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 155665560 + 155665561.

It is an arithmetic number, because the mean of its divisors is an integer number (155665561).

Almost surely, 2^311331121 is an apocalyptic number.

It is an amenable number.

311331121 is a deficient number, since it is larger than the sum of its proper divisors (1).

311331121 is an equidigital number, since it uses as much as digits as its factorization.

311331121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 54, while the sum is 16.

The square root of 311331121 is about 17644.5776656740. The cubic root of 311331121 is about 677.7572601800.

Adding to 311331121 its reverse (121133113), we get a palindrome (432464234).

It can be divided in two parts, 31133112 and 1, that added together give a palindrome (31133113).

The spelling of 311331121 in words is "three hundred eleven million, three hundred thirty-one thousand, one hundred twenty-one".