231320221163 has 2 divisors, whose sum is σ = 231320221164. Its totient is φ = 231320221162.

The previous prime is 231320221159. The next prime is 231320221219. The reversal of 231320221163 is 361122023132.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 231320221163 - 2² = 231320221159 is a prime.

It is not a weakly prime, because it can be changed into another prime (231320221103) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115660110581 + 115660110582.

It is an arithmetic number, because the mean of its divisors is an integer number (115660110582).

Almost surely, 2^231320221163 is an apocalyptic number.

231320221163 is a deficient number, since it is larger than the sum of its proper divisors (1).

231320221163 is an equidigital number, since it uses as much as digits as its factorization.

231320221163 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2592, while the sum is 26.

Adding to 231320221163 its reverse (361122023132), we get a palindrome (592442244295).

The spelling of 231320221163 in words is "two hundred thirty-one billion, three hundred twenty million, two hundred twenty-one thousand, one hundred sixty-three".