31608938 has 4 divisors (see below), whose sum is σ = 47413410. Its totient is φ = 15804468.

The previous prime is 31608937. The next prime is 31608953. The reversal of 31608938 is 83980613.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 16297369 + 15311569 = 4037^2 + 3913^2 .

It is a super-2 number, since 2×31608938² = 1998249922975688, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (31608937) 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 as a sum of consecutive naturals, namely, 7902233 + ... + 7902236.

Almost surely, 2^31608938 is an apocalyptic number.

31608938 is a deficient number, since it is larger than the sum of its proper divisors (15804472).

31608938 is a wasteful number, since it uses less digits than its factorization.

31608938 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15804471.

The product of its (nonzero) digits is 31104, while the sum is 38.

The square root of 31608938 is about 5622.1826722368. The cubic root of 31608938 is about 316.1816306141.

The spelling of 31608938 in words is "thirty-one million, six hundred eight thousand, nine hundred thirty-eight".