31320123 has 4 divisors (see below), whose sum is σ = 41760168. Its totient is φ = 20880080.

The previous prime is 31320109. The next prime is 31320173. The reversal of 31320123 is 32102313.

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 31320123 - 2¹⁸ = 31057979 is a prime.

It is not an unprimeable number, because it can be changed into a prime (31320173) 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, 5220018 + ... + 5220023.

It is an arithmetic number, because the mean of its divisors is an integer number (10440042).

Almost surely, 2^31320123 is an apocalyptic number.

31320123 is a deficient number, since it is larger than the sum of its proper divisors (10440045).

31320123 is a wasteful number, since it uses less digits than its factorization.

31320123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10440044.

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

The square root of 31320123 is about 5596.4384209960. The cubic root of 31320123 is about 315.2156849872.

Adding to 31320123 its reverse (32102313), we get a palindrome (63422436).

The spelling of 31320123 in words is "thirty-one million, three hundred twenty thousand, one hundred twenty-three".