31871242 has 8 divisors (see below), whose sum is σ = 51484356. Its totient is φ = 14709792.

The previous prime is 31871239. The next prime is 31871291. The reversal of 31871242 is 24217813.

It can be written as a sum of positive squares in 2 ways, for example, as 30702681 + 1168561 = 5541^2 + 1081^2 .

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 31871242.

It is an unprimeable number.

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 in 3 ways as a sum of consecutive naturals, for example, 612883 + ... + 612934.

Almost surely, 2^31871242 is an apocalyptic number.

31871242 is a deficient number, since it is larger than the sum of its proper divisors (19613114).

31871242 is a wasteful number, since it uses less digits than its factorization.

31871242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1225832.

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

The square root of 31871242 is about 5645.4620714340. The cubic root of 31871242 is about 317.0538242818.

The spelling of 31871242 in words is "thirty-one million, eight hundred seventy-one thousand, two hundred forty-two".