31243242 has 8 divisors (see below), whose sum is σ = 62486496. Its totient is φ = 10414412.

The previous prime is 31243231. The next prime is 31243249. The reversal of 31243242 is 24234213.

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

31243242 is an admirable number.

It is a super-2 number, since 2×31243242² = 1952280341341128, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (31243249) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2603598 + ... + 2603609.

It is an arithmetic number, because the mean of its divisors is an integer number (7810812).

Almost surely, 2^31243242 is an apocalyptic number.

31243242 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

31243242 is a wasteful number, since it uses less digits than its factorization.

31243242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5207212.

The product of its digits is 1152, while the sum is 21.

The square root of 31243242 is about 5589.5654571711. The cubic root of 31243242 is about 314.9575553796.

Adding to 31243242 its reverse (24234213), we get a palindrome (55477455).

The spelling of 31243242 in words is "thirty-one million, two hundred forty-three thousand, two hundred forty-two".