31161666 has 16 divisors (see below), whose sum is σ = 62402688. Its totient is φ = 10374000.

The previous prime is 31161661. The next prime is 31161673. The reversal of 31161666 is 66616113.

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

It is not an unprimeable number, because it can be changed into a prime (31161661) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2616 + ... + 8316.

It is an arithmetic number, because the mean of its divisors is an integer number (3900168).

Almost surely, 2^31161666 is an apocalyptic number.

31161666 is an abundant number, since it is smaller than the sum of its proper divisors (31241022).

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

31161666 is a wasteful number, since it uses less digits than its factorization.

31161666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6617.

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

The square root of 31161666 is about 5582.2635193978. The cubic root of 31161666 is about 314.6831987528.

Adding to 31161666 its reverse (66616113), we get a palindrome (97777779).

The spelling of 31161666 in words is "thirty-one million, one hundred sixty-one thousand, six hundred sixty-six".