31023 has 10 divisors (see below), whose sum is σ = 46464. Its totient is φ = 20628.

The previous prime is 31019. The next prime is 31033. The reversal of 31023 is 32013.

It is a happy number.

It is not a de Polignac number, because 31023 - 2² = 31019 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a junction number, because it is equal to n+sod(n) for n = 30996 and 31014.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31013) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 111 + ... + 272.

2³¹⁰²³ is an apocalyptic number.

31023 is a deficient number, since it is larger than the sum of its proper divisors (15441).

31023 is an equidigital number, since it uses as much as digits as its factorization.

31023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 395 (or 386 counting only the distinct ones).

The product of its (nonzero) digits is 18, while the sum is 9.

The square root of 31023 is about 176.1334721170. The cubic root of 31023 is about 31.4215736093.

Adding to 31023 its reverse (32013), we get a palindrome (63036).

Subtracting 31023 from its reverse (32013), we obtain a triangular number (990 = T₄₄).

It can be divided in two parts, 310 and 23, that added together give a palindrome (333).

The spelling of 31023 in words is "thirty-one thousand, twenty-three".