31825161 has 6 divisors (see below), whose sum is σ = 45969690. Its totient is φ = 21216768.

The previous prime is 31825159. The next prime is 31825163. The reversal of 31825161 is 16152813.

It is an interprime number because it is at equal distance from previous prime (31825159) and next prime (31825163).

It can be written as a sum of positive squares in only one way, i.e., 29811600 + 2013561 = 5460^2 + 1419^2 .

It is not a de Polignac number, because 31825161 - 2¹ = 31825159 is a prime.

It is not an unprimeable number, because it can be changed into a prime (31825163) 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 5 ways as a sum of consecutive naturals, for example, 1768056 + ... + 1768073.

It is an arithmetic number, because the mean of its divisors is an integer number (7661615).

Almost surely, 2^31825161 is an apocalyptic number.

It is an amenable number.

31825161 is a deficient number, since it is larger than the sum of its proper divisors (14144529).

31825161 is a wasteful number, since it uses less digits than its factorization.

31825161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3536135 (or 3536132 counting only the distinct ones).

The product of its digits is 1440, while the sum is 27.

The square root of 31825161 is about 5641.3793526052. The cubic root of 31825161 is about 316.9009466050.

Adding to 31825161 its reverse (16152813), we get a palindrome (47977974).

The spelling of 31825161 in words is "thirty-one million, eight hundred twenty-five thousand, one hundred sixty-one".