311323421 has 4 divisors (see below), whose sum is σ = 321366144. Its totient is φ = 301280700.

The previous prime is 311323399. The next prime is 311323429. The reversal of 311323421 is 124323113.

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, and also an emirpimes, since its reverse is a distinct semiprime: 124323113 = 31 ⋅4010423.

It is a cyclic number.

It is not a de Polignac number, because 311323421 - 2¹⁴ = 311307037 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 311323393 and 311323402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (311323429) 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, 5021315 + ... + 5021376.

It is an arithmetic number, because the mean of its divisors is an integer number (80341536).

Almost surely, 2^311323421 is an apocalyptic number.

311323421 is a gapful number since it is divisible by the number (31) formed by its first and last digit.

It is an amenable number.

311323421 is a deficient number, since it is larger than the sum of its proper divisors (10042723).

311323421 is a wasteful number, since it uses less digits than its factorization.

311323421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10042722.

The product of its digits is 432, while the sum is 20.

The square root of 311323421 is about 17644.3594669798. The cubic root of 311323421 is about 677.7516725879.

Adding to 311323421 its reverse (124323113), we get a palindrome (435646534).

The spelling of 311323421 in words is "three hundred eleven million, three hundred twenty-three thousand, four hundred twenty-one".