31680135 has 12 divisors (see below), whose sum is σ = 54912312. Its totient is φ = 16896048.

The previous prime is 31680127. The next prime is 31680137. The reversal of 31680135 is 53108613.

It is not a de Polignac number, because 31680135 - 2³ = 31680127 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 31680099 and 31680108.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31680137) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 351957 + ... + 352046.

It is an arithmetic number, because the mean of its divisors is an integer number (4576026).

Almost surely, 2^31680135 is an apocalyptic number.

31680135 is a deficient number, since it is larger than the sum of its proper divisors (23232177).

31680135 is a wasteful number, since it uses less digits than its factorization.

31680135 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 704014 (or 704011 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 27.

The square root of 31680135 is about 5628.5109043156. The cubic root of 31680135 is about 316.4188451959.

Adding to 31680135 its reverse (53108613), we get a palindrome (84788748).

It can be divided in two parts, 3 and 1680135, that multiplied together give a palindrome (5040405).

The spelling of 31680135 in words is "thirty-one million, six hundred eighty thousand, one hundred thirty-five".