684964851 has 4 divisors (see below), whose sum is σ = 913286472. Its totient is φ = 456643232.

The previous prime is 684964849. The next prime is 684964873. The reversal of 684964851 is 158469486.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 684964851 - 2¹ = 684964849 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 684964794 and 684964803.

It is not an unprimeable number, because it can be changed into a prime (684964811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 114160806 + ... + 114160811.

It is an arithmetic number, because the mean of its divisors is an integer number (228321618).

Almost surely, 2^684964851 is an apocalyptic number.

684964851 is a deficient number, since it is larger than the sum of its proper divisors (228321621).

684964851 is a wasteful number, since it uses less digits than its factorization.

684964851 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 228321620.

The product of its digits is 1658880, while the sum is 51.

The square root of 684964851 is about 26171.8331608621. The cubic root of 684964851 is about 881.5009041219.

The spelling of 684964851 in words is "six hundred eighty-four million, nine hundred sixty-four thousand, eight hundred fifty-one".