31123023 has 4 divisors (see below), whose sum is σ = 41497368. Its totient is φ = 20748680.

The previous prime is 31123021. The next prime is 31123067. The reversal of 31123023 is 32032113.

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 31123023 - 2¹ = 31123021 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 31122993 and 31123011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31123021) 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, 5187168 + ... + 5187173.

It is an arithmetic number, because the mean of its divisors is an integer number (10374342).

Almost surely, 2^31123023 is an apocalyptic number.

31123023 is a deficient number, since it is larger than the sum of its proper divisors (10374345).

31123023 is a wasteful number, since it uses less digits than its factorization.

31123023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10374344.

The product of its (nonzero) digits is 108, while the sum is 15.

The square root of 31123023 is about 5578.8012153150. The cubic root of 31123023 is about 314.5530673610.

Adding to 31123023 its reverse (32032113), we get a palindrome (63155136).

The spelling of 31123023 in words is "thirty-one million, one hundred twenty-three thousand, twenty-three".