31123016 has 8 divisors (see below), whose sum is σ = 58355670. Its totient is φ = 15561504.

The previous prime is 31123009. The next prime is 31123019. The reversal of 31123016 is 61032113.

It can be written as a sum of positive squares in only one way, i.e., 29658916 + 1464100 = 5446^2 + 1210^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a junction number, because it is equal to n+sod(n) for n = 31122985 and 31123003.

It is not an unprimeable number, because it can be changed into a prime (31123019) 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 as a sum of consecutive naturals, namely, 1945181 + ... + 1945196.

Almost surely, 2^31123016 is an apocalyptic number.

It is an amenable number.

31123016 is a deficient number, since it is larger than the sum of its proper divisors (27232654).

31123016 is a wasteful number, since it uses less digits than its factorization.

31123016 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3890383 (or 3890379 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 17.

The square root of 31123016 is about 5578.8005879400. The cubic root of 31123016 is about 314.5530437785.

Adding to 31123016 its reverse (61032113), we get a palindrome (92155129).

The spelling of 31123016 in words is "thirty-one million, one hundred twenty-three thousand, sixteen".