31608961 has 8 divisors (see below), whose sum is σ = 31971200. Its totient is φ = 31249152.

The previous prime is 31608959. The next prime is 31608971. The reversal of 31608961 is 16980613.

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 31608961 - 2¹ = 31608959 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31608911) 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, 37996 + ... + 38818.

It is an arithmetic number, because the mean of its divisors is an integer number (3996400).

Almost surely, 2^31608961 is an apocalyptic number.

It is an amenable number.

31608961 is a deficient number, since it is larger than the sum of its proper divisors (362239).

31608961 is a wasteful number, since it uses less digits than its factorization.

31608961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1215.

The product of its (nonzero) digits is 7776, while the sum is 34.

The square root of 31608961 is about 5622.1847177054. The cubic root of 31608961 is about 316.1817073031.

It can be divided in two parts, 3160 and 8961, that added together give a palindrome (12121).

The spelling of 31608961 in words is "thirty-one million, six hundred eight thousand, nine hundred sixty-one".