684303391 has 2 divisors, whose sum is σ = 684303392. Its totient is φ = 684303390.

The previous prime is 684303341. The next prime is 684303421. The reversal of 684303391 is 193303486.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 684303391 - 2²³ = 675914783 is a prime.

It is a super-2 number, since 2×684303391² = 936542261868197762, which contains 22 as substring.

It is equal to p_35481367 and since 684303391 and 35481367 have the same sum of digits, it is a Honaker prime.

It is a self number, because there is not a number n which added to its sum of digits gives 684303391.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (684303311) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 342151695 + 342151696.

It is an arithmetic number, because the mean of its divisors is an integer number (342151696).

Almost surely, 2^684303391 is an apocalyptic number.

684303391 is a deficient number, since it is larger than the sum of its proper divisors (1).

684303391 is an equidigital number, since it uses as much as digits as its factorization.

684303391 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 46656, while the sum is 37.

The square root of 684303391 is about 26159.1932406181. The cubic root of 684303391 is about 881.2170621225.

The spelling of 684303391 in words is "six hundred eighty-four million, three hundred three thousand, three hundred ninety-one".