31241621 has 4 divisors (see below), whose sum is σ = 31771200. Its totient is φ = 30712044.

The previous prime is 31241557. The next prime is 31241627. The reversal of 31241621 is 12614213.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 31241621 - 2⁶ = 31241557 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 31241593 and 31241602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31241627) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 264701 + ... + 264818.

It is an arithmetic number, because the mean of its divisors is an integer number (7942800).

Almost surely, 2^31241621 is an apocalyptic number.

It is an amenable number.

31241621 is a deficient number, since it is larger than the sum of its proper divisors (529579).

31241621 is an equidigital number, since it uses as much as digits as its factorization.

31241621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 529578.

The product of its digits is 288, while the sum is 20.

The square root of 31241621 is about 5589.4204529629. The cubic root of 31241621 is about 314.9521082813.

Adding to 31241621 its reverse (12614213), we get a palindrome (43855834).

The spelling of 31241621 in words is "thirty-one million, two hundred forty-one thousand, six hundred twenty-one".