684260491 has 2 divisors, whose sum is σ = 684260492. Its totient is φ = 684260490.

The previous prime is 684260483. The next prime is 684260501. The reversal of 684260491 is 194062486.

684260491 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 684260491 - 2³ = 684260483 is a prime.

It is a super-2 number, since 2×684260491² = 936424839087122162, which contains 22 as substring.

It is equal to p_35479309 and since 684260491 and 35479309 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (684260431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 342130245 + 342130246.

It is an arithmetic number, because the mean of its divisors is an integer number (342130246).

Almost surely, 2^684260491 is an apocalyptic number.

684260491 is a deficient number, since it is larger than the sum of its proper divisors (1).

684260491 is an equidigital number, since it uses as much as digits as its factorization.

684260491 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 82944, while the sum is 40.

The square root of 684260491 is about 26158.3732483501. The cubic root of 684260491 is about 881.1986468005.

The spelling of 684260491 in words is "six hundred eighty-four million, two hundred sixty thousand, four hundred ninety-one".