31303161 has 24 divisors (see below), whose sum is σ = 47698560. Its totient is φ = 19742976.

The previous prime is 31303157. The next prime is 31303163. The reversal of 31303161 is 16130313.

It is not a de Polignac number, because 31303161 - 2² = 31303157 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31303163) 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, 19300 + ... + 20858.

It is an arithmetic number, because the mean of its divisors is an integer number (1987440).

Almost surely, 2^31303161 is an apocalyptic number.

It is an amenable number.

31303161 is a deficient number, since it is larger than the sum of its proper divisors (16395399).

31303161 is a wasteful number, since it uses less digits than its factorization.

31303161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1685 (or 1682 counting only the distinct ones).

The product of its (nonzero) digits is 162, while the sum is 18.

The square root of 31303161 is about 5594.9227876710. The cubic root of 31303161 is about 315.1587710564.

Adding to 31303161 its reverse (16130313), we get a palindrome (47433474).

The spelling of 31303161 in words is "thirty-one million, three hundred three thousand, one hundred sixty-one".