331220243 has 2 divisors, whose sum is σ = 331220244. Its totient is φ = 331220242.

The previous prime is 331220209. The next prime is 331220249. The reversal of 331220243 is 342022133.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 331220243 - 2¹⁸ = 330958099 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (331220249) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 165610121 + 165610122.

It is an arithmetic number, because the mean of its divisors is an integer number (165610122).

Almost surely, 2^331220243 is an apocalyptic number.

331220243 is a deficient number, since it is larger than the sum of its proper divisors (1).

331220243 is an equidigital number, since it uses as much as digits as its factorization.

331220243 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 864, while the sum is 20.

The square root of 331220243 is about 18199.4572171810. The cubic root of 331220243 is about 691.8930324320.

Adding to 331220243 its reverse (342022133), we get a palindrome (673242376).

The spelling of 331220243 in words is "three hundred thirty-one million, two hundred twenty thousand, two hundred forty-three".