31220166 has 32 divisors (see below), whose sum is σ = 63933408. Its totient is φ = 10160640.

The previous prime is 31220159. The next prime is 31220171. The reversal of 31220166 is 66102213.

It is a happy number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

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, 71886 + ... + 72318.

It is an arithmetic number, because the mean of its divisors is an integer number (1997919).

Almost surely, 2^31220166 is an apocalyptic number.

31220166 is an abundant number, since it is smaller than the sum of its proper divisors (32713242).

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

31220166 is a wasteful number, since it uses less digits than its factorization.

31220166 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 696.

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

The square root of 31220166 is about 5587.5008724832. The cubic root of 31220166 is about 314.8799945998.

Adding to 31220166 its reverse (66102213), we get a palindrome (97322379).

The spelling of 31220166 in words is "thirty-one million, two hundred twenty thousand, one hundred sixty-six".