684179117 has 2 divisors, whose sum is σ = 684179118. Its totient is φ = 684179116.

The previous prime is 684179077. The next prime is 684179129. The reversal of 684179117 is 711971486.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 673610116 + 10569001 = 25954^2 + 3251^2 .

It is a cyclic number.

It is not a de Polignac number, because 684179117 - 2⁶ = 684179053 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (684179147) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 342089558 + 342089559.

It is an arithmetic number, because the mean of its divisors is an integer number (342089559).

Almost surely, 2^684179117 is an apocalyptic number.

It is an amenable number.

684179117 is a deficient number, since it is larger than the sum of its proper divisors (1).

684179117 is an equidigital number, since it uses as much as digits as its factorization.

684179117 is an evil number, because the sum of its binary digits is even.

The product of its digits is 84672, while the sum is 44.

The square root of 684179117 is about 26156.8177919257. The cubic root of 684179117 is about 881.1637139534.

It can be divided in two parts, 6841 and 79117, that added together give a palindrome (85958).

The spelling of 684179117 in words is "six hundred eighty-four million, one hundred seventy-nine thousand, one hundred seventeen".