311121243 has 20 divisors (see below), whose sum is σ = 476102088. Its totient is φ = 202353120.

The previous prime is 311121227. The next prime is 311121259. The reversal of 311121243 is 342121113.

It is an interprime number because it is at equal distance from previous prime (311121227) and next prime (311121259).

It is not a de Polignac number, because 311121243 - 2⁴ = 311121227 is a prime.

It is not an unprimeable number, because it can be changed into a prime (311121263) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 43521 + ... + 50162.

Almost surely, 2^311121243 is an apocalyptic number.

311121243 is a deficient number, since it is larger than the sum of its proper divisors (164980845).

311121243 is an equidigital number, since it uses as much as digits as its factorization.

311121243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93736 (or 93727 counting only the distinct ones).

The product of its digits is 144, while the sum is 18.

The square root of 311121243 is about 17638.6292834789. The cubic root of 311121243 is about 677.6049268550.

Adding to 311121243 its reverse (342121113), we get a palindrome (653242356).

It can be divided in two parts, 311121 and 243, that added together give a square (311364 = 558²).

The spelling of 311121243 in words is "three hundred eleven million, one hundred twenty-one thousand, two hundred forty-three".