31608142 has 4 divisors (see below), whose sum is σ = 47412216. Its totient is φ = 15804070.

The previous prime is 31608133. The next prime is 31608149. The reversal of 31608142 is 24180613.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31608149) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7902034 + ... + 7902037.

It is an arithmetic number, because the mean of its divisors is an integer number (11853054).

Almost surely, 2^31608142 is an apocalyptic number.

31608142 is a deficient number, since it is larger than the sum of its proper divisors (15804074).

31608142 is a wasteful number, since it uses less digits than its factorization.

31608142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15804073.

The product of its (nonzero) digits is 1152, while the sum is 25.

The square root of 31608142 is about 5622.1118807793. Note that the first 3 decimals coincide. The cubic root of 31608142 is about 316.1789764841.

Adding to 31608142 its reverse (24180613), we get a palindrome (55788755).

The spelling of 31608142 in words is "thirty-one million, six hundred eight thousand, one hundred forty-two".