31718642 has 8 divisors (see below), whose sum is σ = 49112832. Its totient is φ = 15347700.

The previous prime is 31718639. The next prime is 31718647. The reversal of 31718642 is 24681713.

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

It is a junction number, because it is equal to n+sod(n) for n = 31718599 and 31718608.

It is not an unprimeable number, because it can be changed into a prime (31718647) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 255734 + ... + 255857.

It is an arithmetic number, because the mean of its divisors is an integer number (6139104).

Almost surely, 2^31718642 is an apocalyptic number.

31718642 is a deficient number, since it is larger than the sum of its proper divisors (17394190).

31718642 is a wasteful number, since it uses less digits than its factorization.

31718642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 511624.

The product of its digits is 8064, while the sum is 32.

The square root of 31718642 is about 5631.9305748562. The cubic root of 31718642 is about 316.5469949775.

The spelling of 31718642 in words is "thirty-one million, seven hundred eighteen thousand, six hundred forty-two".