684951841 has 12 divisors (see below), whose sum is σ = 824257620. Its totient is φ = 566855520.

The previous prime is 684951809. The next prime is 684951857. The reversal of 684951841 is 148159486.

It can be written as a sum of positive squares in 2 ways, for example, as 127803025 + 557148816 = 11305^2 + 23604^2 .

It is not a de Polignac number, because 684951841 - 2⁵ = 684951809 is a prime.

It is a super-3 number, since 3×684951841³ (a number of 27 digits) contains 333 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 684951791 and 684951800.

It is not an unprimeable number, because it can be changed into a prime (684951041) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 239590 + ... + 242431.

It is an arithmetic number, because the mean of its divisors is an integer number (68688135).

Almost surely, 2^684951841 is an apocalyptic number.

It is an amenable number.

684951841 is a deficient number, since it is larger than the sum of its proper divisors (139305779).

684951841 is a wasteful number, since it uses less digits than its factorization.

684951841 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 482064 (or 482057 counting only the distinct ones).

The product of its digits is 276480, while the sum is 46.

The square root of 684951841 is about 26171.5846100308. The cubic root of 684951841 is about 881.4953231059.

The spelling of 684951841 in words is "six hundred eighty-four million, nine hundred fifty-one thousand, eight hundred forty-one".