31109031 has 24 divisors (see below), whose sum is σ = 47983104. Its totient is φ = 19353600.

The previous prime is 31109017. The next prime is 31109047. The reversal of 31109031 is 13090113.

It is a de Polignac number, because none of the positive numbers 2^k-31109031 is a prime.

It is a super-2 number, since 2×31109031² = 1935543619517922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 31108995 and 31109013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31109011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 18631 + ... + 20231.

It is an arithmetic number, because the mean of its divisors is an integer number (1999296).

Almost surely, 2^31109031 is an apocalyptic number.

31109031 is a deficient number, since it is larger than the sum of its proper divisors (16874073).

31109031 is a wasteful number, since it uses less digits than its factorization.

31109031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1751 (or 1748 counting only the distinct ones).

The product of its (nonzero) digits is 81, while the sum is 18.

The square root of 31109031 is about 5577.5470414870. The cubic root of 31109031 is about 314.5059223451.

Adding to 31109031 its reverse (13090113), we get a palindrome (44199144).

The spelling of 31109031 in words is "thirty-one million, one hundred nine thousand, thirty-one".