684253529 has 2 divisors, whose sum is σ = 684253530. Its totient is φ = 684253528.

The previous prime is 684253499. The next prime is 684253567. The reversal of 684253529 is 925352486.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 680009929 + 4243600 = 26077^2 + 2060^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-684253529 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 684253529.

It is not a weakly prime, because it can be changed into another prime (684253429) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 342126764 + 342126765.

It is an arithmetic number, because the mean of its divisors is an integer number (342126765).

Almost surely, 2^684253529 is an apocalyptic number.

It is an amenable number.

684253529 is a deficient number, since it is larger than the sum of its proper divisors (1).

684253529 is an equidigital number, since it uses as much as digits as its factorization.

684253529 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 518400, while the sum is 44.

The square root of 684253529 is about 26158.2401739872. The cubic root of 684253529 is about 881.1956582087.

The spelling of 684253529 in words is "six hundred eighty-four million, two hundred fifty-three thousand, five hundred twenty-nine".