31334321 has 2 divisors, whose sum is σ = 31334322. Its totient is φ = 31334320.

The previous prime is 31334311. The next prime is 31334327. The reversal of 31334321 is 12343313.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 30924721 + 409600 = 5561^2 + 640^2 .

It is an emirp because it is prime and its reverse (12343313) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31334321 - 2¹⁰ = 31333297 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 31334293 and 31334302.

It is not a weakly prime, because it can be changed into another prime (31334327) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15667160 + 15667161.

It is an arithmetic number, because the mean of its divisors is an integer number (15667161).

Almost surely, 2^31334321 is an apocalyptic number.

It is an amenable number.

31334321 is a deficient number, since it is larger than the sum of its proper divisors (1).

31334321 is an equidigital number, since it uses as much as digits as its factorization.

31334321 is an evil number, because the sum of its binary digits is even.

The product of its digits is 648, while the sum is 20.

The square root of 31334321 is about 5597.7067625948. The cubic root of 31334321 is about 315.2633088550.

Adding to 31334321 its reverse (12343313), we get a palindrome (43677634).

The spelling of 31334321 in words is "thirty-one million, three hundred thirty-four thousand, three hundred twenty-one".