311220113 has 4 divisors (see below), whose sum is σ = 311575860. Its totient is φ = 310864368.

The previous prime is 311220073. The next prime is 311220121. The reversal of 311220113 is 311022113.

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 194407249 + 116812864 = 13943^2 + 10808^2 .

It is a cyclic number.

It is not a de Polignac number, because 311220113 - 2¹⁶ = 311154577 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (311220163) 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, 176558 + ... + 178311.

It is an arithmetic number, because the mean of its divisors is an integer number (77893965).

Almost surely, 2^311220113 is an apocalyptic number.

It is an amenable number.

311220113 is a deficient number, since it is larger than the sum of its proper divisors (355747).

311220113 is an equidigital number, since it uses as much as digits as its factorization.

311220113 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 355746.

The product of its (nonzero) digits is 36, while the sum is 14.

The square root of 311220113 is about 17641.4317162752. The cubic root of 311220113 is about 677.6766970574.

Adding to 311220113 its reverse (311022113), we get a palindrome (622242226).

The spelling of 311220113 in words is "three hundred eleven million, two hundred twenty thousand, one hundred thirteen".