31109742 has 12 divisors (see below), whose sum is σ = 67404480. Its totient is φ = 10369908.

The previous prime is 31109719. The next prime is 31109747. The reversal of 31109742 is 24790113.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31109747) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 864142 + ... + 864177.

It is an arithmetic number, because the mean of its divisors is an integer number (5617040).

Almost surely, 2^31109742 is an apocalyptic number.

31109742 is an abundant number, since it is smaller than the sum of its proper divisors (36294738).

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

31109742 is a wasteful number, since it uses less digits than its factorization.

31109742 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1728327 (or 1728324 counting only the distinct ones).

The product of its (nonzero) digits is 1512, while the sum is 27.

The square root of 31109742 is about 5577.6107788192. The cubic root of 31109742 is about 314.5083183482.

Adding to 31109742 its reverse (24790113), we get a palindrome (55899855).

The spelling of 31109742 in words is "thirty-one million, one hundred nine thousand, seven hundred forty-two".