684057613 has 2 divisors, whose sum is σ = 684057614. Its totient is φ = 684057612.

The previous prime is 684057593. The next prime is 684057617. The reversal of 684057613 is 316750486.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 575856009 + 108201604 = 23997^2 + 10402^2 .

It is a cyclic number.

It is not a de Polignac number, because 684057613 - 2⁵ = 684057581 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (684057617) 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, 342028806 + 342028807.

It is an arithmetic number, because the mean of its divisors is an integer number (342028807).

Almost surely, 2^684057613 is an apocalyptic number.

It is an amenable number.

684057613 is a deficient number, since it is larger than the sum of its proper divisors (1).

684057613 is an equidigital number, since it uses as much as digits as its factorization.

684057613 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 120960, while the sum is 40.

The square root of 684057613 is about 26154.4950821078. The cubic root of 684057613 is about 881.1115486398. Note that the first 3 decimals are identical.

The spelling of 684057613 in words is "six hundred eighty-four million, fifty-seven thousand, six hundred thirteen".