31324161 has 16 divisors (see below), whose sum is σ = 45708480. Its totient is φ = 18923520.

The previous prime is 31324133. The next prime is 31324187. The reversal of 31324161 is 16142313.

It is a de Polignac number, because none of the positive numbers 2^k-31324161 is a prime.

It is not an unprimeable number, because it can be changed into a prime (31324061) 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 15 ways as a sum of consecutive naturals, for example, 10305 + ... + 12993.

It is an arithmetic number, because the mean of its divisors is an integer number (2856780).

Almost surely, 2^31324161 is an apocalyptic number.

It is an amenable number.

31324161 is a deficient number, since it is larger than the sum of its proper divisors (14384319).

31324161 is a wasteful number, since it uses less digits than its factorization.

31324161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3056.

The product of its digits is 432, while the sum is 21.

The square root of 31324161 is about 5596.7991745282. The cubic root of 31324161 is about 315.2292309774.

Adding to 31324161 its reverse (16142313), we get a palindrome (47466474).

The spelling of 31324161 in words is "thirty-one million, three hundred twenty-four thousand, one hundred sixty-one".