684129937 has 2 divisors, whose sum is σ = 684129938. Its totient is φ = 684129936.

The previous prime is 684129931. The next prime is 684129947. The reversal of 684129937 is 739921486.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 525143056 + 158986881 = 22916^2 + 12609^2 .

It is a cyclic number.

It is not a de Polignac number, because 684129937 - 2²³ = 675741329 is a prime.

It is not a weakly prime, because it can be changed into another prime (684129931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 342064968 + 342064969.

It is an arithmetic number, because the mean of its divisors is an integer number (342064969).

Almost surely, 2^684129937 is an apocalyptic number.

It is an amenable number.

684129937 is a deficient number, since it is larger than the sum of its proper divisors (1).

684129937 is an equidigital number, since it uses as much as digits as its factorization.

684129937 is an evil number, because the sum of its binary digits is even.

The product of its digits is 653184, while the sum is 49.

The square root of 684129937 is about 26155.8776759642. The cubic root of 684129937 is about 881.1426002475.

The spelling of 684129937 in words is "six hundred eighty-four million, one hundred twenty-nine thousand, nine hundred thirty-seven".