311013121 has 4 divisors (see below), whose sum is σ = 311894532. Its totient is φ = 310131712.

The previous prime is 311013103. The next prime is 311013133. The reversal of 311013121 is 121310113.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 121310113 = 17 ⋅7135889.

It can be written as a sum of positive squares in 2 ways, for example, as 98903025 + 212110096 = 9945^2 + 14564^2 .

It is a cyclic number.

It is not a de Polignac number, because 311013121 - 2⁷ = 311012993 is a prime.

It is a super-2 number, since 2×311013121² = 193458322868321282, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (311013161) 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, 440176 + ... + 440881.

It is an arithmetic number, because the mean of its divisors is an integer number (77973633).

Almost surely, 2^311013121 is an apocalyptic number.

It is an amenable number.

311013121 is a deficient number, since it is larger than the sum of its proper divisors (881411).

311013121 is an equidigital number, since it uses as much as digits as its factorization.

311013121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 881410.

The product of its (nonzero) digits is 18, while the sum is 13.

The square root of 311013121 is about 17635.5640964501. The cubic root of 311013121 is about 677.5264231739.

Adding to 311013121 its reverse (121310113), we get a palindrome (432323234).

The spelling of 311013121 in words is "three hundred eleven million, thirteen thousand, one hundred twenty-one".