684917153 has 2 divisors, whose sum is σ = 684917154. Its totient is φ = 684917152.

The previous prime is 684917141. The next prime is 684917179. The reversal of 684917153 is 351719486.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 552391009 + 132526144 = 23503^2 + 11512^2 .

It is a cyclic number.

It is not a de Polignac number, because 684917153 - 2⁴ = 684917137 is a prime.

It is a super-2 number, since 2×684917153² = 938223012947250818, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (684917113) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 342458576 + 342458577.

It is an arithmetic number, because the mean of its divisors is an integer number (342458577).

Almost surely, 2^684917153 is an apocalyptic number.

It is an amenable number.

684917153 is a deficient number, since it is larger than the sum of its proper divisors (1).

684917153 is an equidigital number, since it uses as much as digits as its factorization.

684917153 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 181440, while the sum is 44.

The square root of 684917153 is about 26170.9218981678. The cubic root of 684917153 is about 881.4804423391.

The spelling of 684917153 in words is "six hundred eighty-four million, nine hundred seventeen thousand, one hundred fifty-three".