684228973 has 2 divisors, whose sum is σ = 684228974. Its totient is φ = 684228972.

The previous prime is 684228913. The next prime is 684228989. The reversal of 684228973 is 379822486.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 466430409 + 217798564 = 21597^2 + 14758^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-684228973 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (684228913) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 342114486 + 342114487.

It is an arithmetic number, because the mean of its divisors is an integer number (342114487).

Almost surely, 2^684228973 is an apocalyptic number.

It is an amenable number.

684228973 is a deficient number, since it is larger than the sum of its proper divisors (1).

684228973 is an equidigital number, since it uses as much as digits as its factorization.

684228973 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1161216, while the sum is 49.

The square root of 684228973 is about 26157.7707956928. The cubic root of 684228973 is about 881.1851168433.

The spelling of 684228973 in words is "six hundred eighty-four million, two hundred twenty-eight thousand, nine hundred seventy-three".