231220233331 has 2 divisors, whose sum is σ = 231220233332. Its totient is φ = 231220233330.

The previous prime is 231220233311. The next prime is 231220233371. The reversal of 231220233331 is 133332022132.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 231220233331 - 2⁹ = 231220232819 is a prime.

It is a super-2 number, since 2×231220233331² (a number of 24 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 231220233296 and 231220233305.

It is not a weakly prime, because it can be changed into another prime (231220233311) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115610116665 + 115610116666.

It is an arithmetic number, because the mean of its divisors is an integer number (115610116666).

Almost surely, 2^231220233331 is an apocalyptic number.

231220233331 is a deficient number, since it is larger than the sum of its proper divisors (1).

231220233331 is an equidigital number, since it uses as much as digits as its factorization.

231220233331 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3888, while the sum is 25.

Adding to 231220233331 its reverse (133332022132), we get a palindrome (364552255463).

The spelling of 231220233331 in words is "two hundred thirty-one billion, two hundred twenty million, two hundred thirty-three thousand, three hundred thirty-one".