684316794731 has 2 divisors, whose sum is σ = 684316794732. Its totient is φ = 684316794730.

The previous prime is 684316794727. The next prime is 684316794739. The reversal of 684316794731 is 137497613486.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 684316794731 - 2² = 684316794727 is a prime.

It is a super-2 number, since 2×684316794731² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (684316794739) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 342158397365 + 342158397366.

It is an arithmetic number, because the mean of its divisors is an integer number (342158397366).

Almost surely, 2^684316794731 is an apocalyptic number.

684316794731 is a deficient number, since it is larger than the sum of its proper divisors (1).

684316794731 is an equidigital number, since it uses as much as digits as its factorization.

684316794731 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 18289152, while the sum is 59.

The spelling of 684316794731 in words is "six hundred eighty-four billion, three hundred sixteen million, seven hundred ninety-four thousand, seven hundred thirty-one".