684332137 has 2 divisors, whose sum is σ = 684332138. Its totient is φ = 684332136.

The previous prime is 684332119. The next prime is 684332141. The reversal of 684332137 is 731233486.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 595896921 + 88435216 = 24411^2 + 9404^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-684332137 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 684332096 and 684332105.

It is not a weakly prime, because it can be changed into another prime (684332197) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 342166068 + 342166069.

It is an arithmetic number, because the mean of its divisors is an integer number (342166069).

Almost surely, 2^684332137 is an apocalyptic number.

It is an amenable number.

684332137 is a deficient number, since it is larger than the sum of its proper divisors (1).

684332137 is an equidigital number, since it uses as much as digits as its factorization.

684332137 is an evil number, because the sum of its binary digits is even.

The product of its digits is 72576, while the sum is 37.

The square root of 684332137 is about 26159.7426783980. The cubic root of 684332137 is about 881.2294012455.

The spelling of 684332137 in words is "six hundred eighty-four million, three hundred thirty-two thousand, one hundred thirty-seven".