311020223 has 4 divisors (see below), whose sum is σ = 315280848. Its totient is φ = 306759600.

The previous prime is 311020169. The next prime is 311020279. The reversal of 311020223 is 322020113.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 311020223 - 2⁸ = 311019967 is a prime.

It is a super-2 number, since 2×311020223² = 193467158229939458, 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 = 311020198 and 311020207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (311026223) 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, 2130203 + ... + 2130348.

It is an arithmetic number, because the mean of its divisors is an integer number (78820212).

Almost surely, 2^311020223 is an apocalyptic number.

311020223 is a deficient number, since it is larger than the sum of its proper divisors (4260625).

311020223 is an equidigital number, since it uses as much as digits as its factorization.

311020223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4260624.

The product of its (nonzero) digits is 72, while the sum is 14.

The square root of 311020223 is about 17635.7654497898. The cubic root of 311020223 is about 677.5315802511.

Adding to 311020223 its reverse (322020113), we get a palindrome (633040336).

The spelling of 311020223 in words is "three hundred eleven million, twenty thousand, two hundred twenty-three".