31111242 has 16 divisors (see below), whose sum is σ = 62294400. Its totient is φ = 10358432.

The previous prime is 31111237. The next prime is 31111243. The reversal of 31111242 is 24211113.

It is not an unprimeable number, because it can be changed into a prime (31111243) 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 in 7 ways as a sum of consecutive naturals, for example, 3823 + ... + 8765.

It is an arithmetic number, because the mean of its divisors is an integer number (3893400).

Almost surely, 2^31111242 is an apocalyptic number.

31111242 is an abundant number, since it is smaller than the sum of its proper divisors (31183158).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

31111242 is a wasteful number, since it uses less digits than its factorization.

31111242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5997.

The product of its digits is 48, while the sum is 15.

The square root of 31111242 is about 5577.7452433757. The cubic root of 31111242 is about 314.5133730874.

Adding to 31111242 its reverse (24211113), we get a palindrome (55322355).

The spelling of 31111242 in words is "thirty-one million, one hundred eleven thousand, two hundred forty-two".