31241321 has 4 divisors (see below), whose sum is σ = 31254144. Its totient is φ = 31228500.

The previous prime is 31241317. The next prime is 31241351. The reversal of 31241321 is 12314213.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 31241321 - 2² = 31241317 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 31241321.

It is not an unprimeable number, because it can be changed into a prime (31241351) 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, 1505 + ... + 8046.

It is an arithmetic number, because the mean of its divisors is an integer number (7813536).

Almost surely, 2^31241321 is an apocalyptic number.

It is an amenable number.

31241321 is a deficient number, since it is larger than the sum of its proper divisors (12823).

31241321 is an equidigital number, since it uses as much as digits as its factorization.

31241321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12822.

The product of its digits is 144, while the sum is 17.

The square root of 31241321 is about 5589.3936164847. The cubic root of 31241321 is about 314.9511001610.

Adding to 31241321 its reverse (12314213), we get a palindrome (43555534).

The spelling of 31241321 in words is "thirty-one million, two hundred forty-one thousand, three hundred twenty-one".