311343431 has 4 divisors (see below), whose sum is σ = 355821072. Its totient is φ = 266865792.

The previous prime is 311343401. The next prime is 311343497. The reversal of 311343431 is 134343113.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 134343113 = 4019 ⋅33427.

It is a cyclic number.

It is not a de Polignac number, because 311343431 - 2¹⁰ = 311342407 is a prime.

It is a super-2 number, since 2×311343431² = 193869464053703522, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 311343397 and 311343406.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (311343401) 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, 22238810 + ... + 22238823.

It is an arithmetic number, because the mean of its divisors is an integer number (88955268).

Almost surely, 2^311343431 is an apocalyptic number.

311343431 is a deficient number, since it is larger than the sum of its proper divisors (44477641).

311343431 is an equidigital number, since it uses as much as digits as its factorization.

311343431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44477640.

The product of its digits is 1296, while the sum is 23.

The square root of 311343431 is about 17644.9264946046. The cubic root of 311343431 is about 677.7661928793.

Adding to 311343431 its reverse (134343113), we get a palindrome (445686544).

The spelling of 311343431 in words is "three hundred eleven million, three hundred forty-three thousand, four hundred thirty-one".