31661146 has 16 divisors (see below), whose sum is σ = 52467840. Its totient is φ = 14208480.

The previous prime is 31661141. The next prime is 31661167. The reversal of 31661146 is 64116613.

It is not an unprimeable number, because it can be changed into a prime (31661141) 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 7 ways as a sum of consecutive naturals, for example, 7371 + ... + 10846.

It is an arithmetic number, because the mean of its divisors is an integer number (3279240).

Almost surely, 2^31661146 is an apocalyptic number.

31661146 is a deficient number, since it is larger than the sum of its proper divisors (20806694).

31661146 is a wasteful number, since it uses less digits than its factorization.

31661146 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18309.

The product of its digits is 2592, while the sum is 28.

The square root of 31661146 is about 5626.8237932247. The cubic root of 31661146 is about 316.3556123179.

Adding to 31661146 its reverse (64116613), we get a palindrome (95777759).

The spelling of 31661146 in words is "thirty-one million, six hundred sixty-one thousand, one hundred forty-six".