402505312331 has 2 divisors, whose sum is σ = 402505312332. Its totient is φ = 402505312330.

The previous prime is 402505312301. The next prime is 402505312357. The reversal of 402505312331 is 133213505204.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 402505312331 - 2⁶ = 402505312267 is a prime.

It is a super-2 number, since 2×402505312331² (a number of 24 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 402505312294 and 402505312303.

It is not a weakly prime, because it can be changed into another prime (402505312301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 201252656165 + 201252656166.

It is an arithmetic number, because the mean of its divisors is an integer number (201252656166).

Almost surely, 2^402505312331 is an apocalyptic number.

402505312331 is a deficient number, since it is larger than the sum of its proper divisors (1).

402505312331 is an equidigital number, since it uses as much as digits as its factorization.

402505312331 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10800, while the sum is 29.

Adding to 402505312331 its reverse (133213505204), we get a palindrome (535718817535).

The spelling of 402505312331 in words is "four hundred two billion, five hundred five million, three hundred twelve thousand, three hundred thirty-one".