311121013 has 4 divisors (see below), whose sum is σ = 355566880. Its totient is φ = 266675148.

The previous prime is 311121007. The next prime is 311121043. The reversal of 311121013 is 310121113.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 311121013 - 2²⁵ = 277566581 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 311120984 and 311121002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (311121043) 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, 22222923 + ... + 22222936.

It is an arithmetic number, because the mean of its divisors is an integer number (88891720).

Almost surely, 2^311121013 is an apocalyptic number.

It is an amenable number.

311121013 is a deficient number, since it is larger than the sum of its proper divisors (44445867).

311121013 is an equidigital number, since it uses as much as digits as its factorization.

311121013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44445866.

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

The square root of 311121013 is about 17638.6227636967. The cubic root of 311121013 is about 677.6047598792.

Adding to 311121013 its reverse (310121113), we get a palindrome (621242126).

The spelling of 311121013 in words is "three hundred eleven million, one hundred twenty-one thousand, thirteen".