31321123 has 4 divisors (see below), whose sum is σ = 33163560. Its totient is φ = 29478688.

The previous prime is 31321109. The next prime is 31321127. The reversal of 31321123 is 32112313.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31321123 is a prime.

It is a super-2 number, since 2×31321123² = 1962025491962258, 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 = 31321097 and 31321106.

It is not an unprimeable number, because it can be changed into a prime (31321127) 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, 921193 + ... + 921226.

It is an arithmetic number, because the mean of its divisors is an integer number (8290890).

Almost surely, 2^31321123 is an apocalyptic number.

31321123 is a deficient number, since it is larger than the sum of its proper divisors (1842437).

31321123 is a wasteful number, since it uses less digits than its factorization.

31321123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1842436.

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

The square root of 31321123 is about 5596.5277628187. The cubic root of 31321123 is about 315.2190397242.

Adding to 31321123 its reverse (32112313), we get a palindrome (63433436).

The spelling of 31321123 in words is "thirty-one million, three hundred twenty-one thousand, one hundred twenty-three".