31680105 has 8 divisors (see below), whose sum is σ = 50688192. Its totient is φ = 16896048.

The previous prime is 31680101. The next prime is 31680113. The reversal of 31680105 is 50108613.

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

It is not a de Polignac number, because 31680105 - 2² = 31680101 is a prime.

It is a super-2 number, since 2×31680105² = 2007258105622050, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (31680101) 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, 1055989 + ... + 1056018.

It is an arithmetic number, because the mean of its divisors is an integer number (6336024).

Almost surely, 2^31680105 is an apocalyptic number.

It is an amenable number.

31680105 is a deficient number, since it is larger than the sum of its proper divisors (19008087).

31680105 is a wasteful number, since it uses less digits than its factorization.

31680105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2112015.

The product of its (nonzero) digits is 720, while the sum is 24.

The square root of 31680105 is about 5628.5082393117. The cubic root of 31680105 is about 316.4187453166.

Adding to 31680105 its reverse (50108613), we get a palindrome (81788718).

The spelling of 31680105 in words is "thirty-one million, six hundred eighty thousand, one hundred five".