311023223 has 4 divisors (see below), whose sum is σ = 355455120. Its totient is φ = 266591328.

The previous prime is 311023189. The next prime is 311023249. The reversal of 311023223 is 322320113.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 322320113 = 31 ⋅10397423.

It is a cyclic number.

It is not a de Polignac number, because 311023223 - 2⁸ = 311022967 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (311023283) 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, 22215938 + ... + 22215951.

It is an arithmetic number, because the mean of its divisors is an integer number (88863780).

Almost surely, 2^311023223 is an apocalyptic number.

311023223 is a deficient number, since it is larger than the sum of its proper divisors (44431897).

311023223 is an equidigital number, since it uses as much as digits as its factorization.

311023223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44431896.

The product of its (nonzero) digits is 216, while the sum is 17.

The square root of 311023223 is about 17635.8505040160. The cubic root of 311023223 is about 677.5337586606.

Adding to 311023223 its reverse (322320113), we get a palindrome (633343336).

The spelling of 311023223 in words is "three hundred eleven million, twenty-three thousand, two hundred twenty-three".