31424242 has 4 divisors (see below), whose sum is σ = 47136366. Its totient is φ = 15712120.

The previous prime is 31424227. The next prime is 31424243. The reversal of 31424242 is 24242413.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 24242413 = 13 ⋅1864801.

It can be written as a sum of positive squares in only one way, i.e., 22005481 + 9418761 = 4691^2 + 3069^2 .

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (31424243) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7856059 + ... + 7856062.

Almost surely, 2^31424242 is an apocalyptic number.

31424242 is a deficient number, since it is larger than the sum of its proper divisors (15712124).

31424242 is a wasteful number, since it uses less digits than its factorization.

31424242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15712123.

The product of its digits is 1536, while the sum is 22.

The square root of 31424242 is about 5605.7329583204. The cubic root of 31424242 is about 315.5645942237.

Adding to 31424242 its reverse (24242413), we get a palindrome (55666655).

The spelling of 31424242 in words is "thirty-one million, four hundred twenty-four thousand, two hundred forty-two".