311623 has 4 divisors (see below), whose sum is σ = 335608. Its totient is φ = 287640.

The previous prime is 311609. The next prime is 311653. The reversal of 311623 is 326113.

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 311623 - 2⁹ = 311111 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 311597 and 311606.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (311603) 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, 11973 + ... + 11998.

It is an arithmetic number, because the mean of its divisors is an integer number (83902).

2³¹¹⁶²³ is an apocalyptic number.

311623 is a deficient number, since it is larger than the sum of its proper divisors (23985).

311623 is a wasteful number, since it uses less digits than its factorization.

311623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23984.

The product of its digits is 108, while the sum is 16.

The square root of 311623 is about 558.2320306109. The cubic root of 311623 is about 67.7968997576.

Adding to 311623 its reverse (326113), we get a palindrome (637736).

It can be divided in two parts, 311 and 623, that multiplied together give a triangular number (193753 = T₆₂₂).

The spelling of 311623 in words is "three hundred eleven thousand, six hundred twenty-three".