31606561 has 8 divisors (see below), whose sum is σ = 36226944. Its totient is φ = 27012480.

The previous prime is 31606559. The next prime is 31606579. The reversal of 31606561 is 16560613.

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

It is a cyclic number.

It is not a de Polignac number, because 31606561 - 2¹ = 31606559 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31606541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3925 + ... + 8866.

It is an arithmetic number, because the mean of its divisors is an integer number (4528368).

Almost surely, 2^31606561 is an apocalyptic number.

It is an amenable number.

31606561 is a deficient number, since it is larger than the sum of its proper divisors (4620383).

31606561 is a wasteful number, since it uses less digits than its factorization.

31606561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13151.

The product of its (nonzero) digits is 3240, while the sum is 28.

The square root of 31606561 is about 5621.9712734947. The cubic root of 31606561 is about 316.1737047696.

The spelling of 31606561 in words is "thirty-one million, six hundred six thousand, five hundred sixty-one".