31817242 has 8 divisors (see below), whose sum is σ = 47761632. Its totient is φ = 15896700.

The previous prime is 31817231. The next prime is 31817243. The reversal of 31817242 is 24271813.

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

It is a self number, because there is not a number n which added to its sum of digits gives 31817242.

It is not an unprimeable number, because it can be changed into a prime (31817243) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2134 + ... + 8257.

It is an arithmetic number, because the mean of its divisors is an integer number (5970204).

Almost surely, 2^31817242 is an apocalyptic number.

31817242 is a deficient number, since it is larger than the sum of its proper divisors (15944390).

31817242 is a wasteful number, since it uses less digits than its factorization.

31817242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11924.

The product of its digits is 2688, while the sum is 28.

The square root of 31817242 is about 5640.6774415845. The cubic root of 31817242 is about 316.8746597856.

The spelling of 31817242 in words is "thirty-one million, eight hundred seventeen thousand, two hundred forty-two".