31013923 has 4 divisors (see below), whose sum is σ = 31240440. Its totient is φ = 30787408.

The previous prime is 31013911. The next prime is 31013929. The reversal of 31013923 is 32931013.

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-31013923 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31013894 and 31013903.

It is not an unprimeable number, because it can be changed into a prime (31013929) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 113053 + ... + 113326.

It is an arithmetic number, because the mean of its divisors is an integer number (7810110).

Almost surely, 2^31013923 is an apocalyptic number.

31013923 is a deficient number, since it is larger than the sum of its proper divisors (226517).

31013923 is a wasteful number, since it uses less digits than its factorization.

31013923 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 226516.

The product of its (nonzero) digits is 486, while the sum is 22.

The square root of 31013923 is about 5569.0145447826. The cubic root of 31013923 is about 314.1850877085.

Adding to 31013923 its reverse (32931013), we get a palindrome (63944936).

The spelling of 31013923 in words is "thirty-one million, thirteen thousand, nine hundred twenty-three".