331220321230091 has 2 divisors, whose sum is σ = 331220321230092. Its totient is φ = 331220321230090.

The previous prime is 331220321230039. The next prime is 331220321230153. The reversal of 331220321230091 is 190032123022133.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 331220321230091 - 2⁶ = 331220321230027 is a prime.

It is a super-2 number, since 2×331220321230091² (a number of 30 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (331220321230991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 165610160615045 + 165610160615046.

It is an arithmetic number, because the mean of its divisors is an integer number (165610160615046).

Almost surely, 2^{331220321230091} is an apocalyptic number.

331220321230091 is a deficient number, since it is larger than the sum of its proper divisors (1).

331220321230091 is an equidigital number, since it uses as much as digits as its factorization.

331220321230091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11664, while the sum is 32.

The spelling of 331220321230091 in words is "three hundred thirty-one trillion, two hundred twenty billion, three hundred twenty-one million, two hundred thirty thousand, ninety-one".