31621242 has 16 divisors (see below), whose sum is σ = 63803520. Its totient is φ = 10446912.

The previous prime is 31621237. The next prime is 31621259. The reversal of 31621242 is 24212613.

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 7 ways as a sum of consecutive naturals, for example, 22642 + ... + 23997.

It is an arithmetic number, because the mean of its divisors is an integer number (3987720).

Almost surely, 2^31621242 is an apocalyptic number.

31621242 is an abundant number, since it is smaller than the sum of its proper divisors (32182278).

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

31621242 is a wasteful number, since it uses less digits than its factorization.

31621242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46757.

The product of its digits is 576, while the sum is 21.

The square root of 31621242 is about 5623.2768027192. The cubic root of 31621242 is about 316.2226505951. Note that the first 3 decimals are identical.

Adding to 31621242 its reverse (24212613), we get a palindrome (55833855).

The spelling of 31621242 in words is "thirty-one million, six hundred twenty-one thousand, two hundred forty-two".