684131 has 8 divisors (see below), whose sum is σ = 828000. Its totient is φ = 551808.

The previous prime is 684127. The next prime is 684157. The reversal of 684131 is 131486.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 684131 - 2² = 684127 is a prime.

It is a super-2 number, since 2×684131² = 936070450322, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 684097 and 684106.

It is not an unprimeable number, because it can be changed into a prime (684121) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2756 + ... + 2993.

It is an arithmetic number, because the mean of its divisors is an integer number (103500).

2⁶⁸⁴¹³¹ is an apocalyptic number.

684131 is a deficient number, since it is larger than the sum of its proper divisors (143869).

684131 is a wasteful number, since it uses less digits than its factorization.

684131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5773.

The product of its digits is 576, while the sum is 23.

The square root of 684131 is about 827.1221191577. The cubic root of 684131 is about 88.1143056620.

The spelling of 684131 in words is "six hundred eighty-four thousand, one hundred thirty-one".