31323113 has 4 divisors (see below), whose sum is σ = 32333568. Its totient is φ = 30312660.

The previous prime is 31323107. The next prime is 31323133. The reversal of 31323113 is 31132313.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 31132313 = 449 ⋅69337.

It is a cyclic number.

It is not a de Polignac number, because 31323113 - 2¹² = 31319017 is a prime.

It is a super-2 number, since 2×31323113² = 1962274816021538, 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 = 31323091 and 31323100.

It is not an unprimeable number, because it can be changed into a prime (31323133) 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, 505181 + ... + 505242.

It is an arithmetic number, because the mean of its divisors is an integer number (8083392).

Almost surely, 2^31323113 is an apocalyptic number.

It is an amenable number.

31323113 is a deficient number, since it is larger than the sum of its proper divisors (1010455).

31323113 is a wasteful number, since it uses less digits than its factorization.

31323113 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1010454.

The product of its digits is 162, while the sum is 17.

The square root of 31323113 is about 5596.7055488028. The cubic root of 31323113 is about 315.2257154385.

Adding to 31323113 its reverse (31132313), we get a palindrome (62455426).

The spelling of 31323113 in words is "thirty-one million, three hundred twenty-three thousand, one hundred thirteen".