31661166 has 8 divisors (see below), whose sum is σ = 63322344. Its totient is φ = 10553720.

The previous prime is 31661141. The next prime is 31661167. The reversal of 31661166 is 66116613.

It is a sphenic number, since it is the product of 3 distinct primes.

31661166 is an admirable number.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31661167) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2638425 + ... + 2638436.

It is an arithmetic number, because the mean of its divisors is an integer number (7915293).

Almost surely, 2^31661166 is an apocalyptic number.

31661166 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

31661166 is a wasteful number, since it uses less digits than its factorization.

31661166 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5276866.

The product of its digits is 3888, while the sum is 30.

The square root of 31661166 is about 5626.8255704260. The cubic root of 31661166 is about 316.3556789306.

Adding to 31661166 its reverse (66116613), we get a palindrome (97777779).

The spelling of 31661166 in words is "thirty-one million, six hundred sixty-one thousand, one hundred sixty-six".